我是这样清除系统垃圾的(几年经验)
1.软件安装过程中产生的临时文件
许多软件在安装时，首先要把自身的安装文件解压缩到一个临时目录（一般为 Windows文件夹下的Temp目录），如WinZip等工具，然后再进行安装。
如果软件设计有疏忽或者系统有问题，当安装结束后，这些临时文件就会变得并不“临时”，成为硬盘里的一堆垃圾。很多时候它们以*.tmp的面孔出现。
在软件的运行过程中通常也会产生一些临时交换文件，比如一些程序工作时产生的形如*.old、*.bak这样的备份文件，杀毒软件或系统软件检查硬盘时生成的备份文件等。
一些应用软件自带的帮助或教程文件（常以.hlp等作为后缀），操作系统中多余的字体文件等。大量的字体文件不仅身体肥壮，占用空间甚大，更会严重拖累系统和一些图形处理软件的运行速度。另外，“系统还原”文件夹也占用了大量的磁盘空间。
由于Windows的多数软件都使用了动态链接库（DLL），也有一些软件的设计还不太成熟，导致了很多软件被卸载后，经常会在硬盘中留下一些文件夹、*.dll文件、*.hlp文件和注册表键值以及形形色色不知名的小东西，成为名副其实的垃圾。
3.上网冲浪产生的临时文件
上网时浏览器将部分网页文件下载到本地机器上，不但占用了宝贵的磁盘空间，还会把个人隐私公之于众。另外，也会产生历史记录、临时缓存文件、Cookie等基本无用的“废物”。
如何删除垃圾文件
1.删除系统产生的临时文件
Windows在安装和使用过程中产生的垃圾包括临时文件（如*.tmp、*._mp等）、临时备份文件（如*.bak、*.old、*.syd 等）、临时帮助文件（*.gid）、磁盘检查数据文件（*.chk）以及*.dir、*.dmp、*.nch等其他临时文件。你可以通过系统的“查找”功能，将这些“垃圾”从硬盘中找出来删除掉，方法：将这些文件全选后击鼠标右键，选择删除即可。“C：\Temp”和“C：\WINDOWS\Temp”这两个临时文件夹也是“垃圾”滋生地，里面存放的都是临时文件，可放心地全部删除。
2.删除不常用的文件
在“控制面板”中进入“添加/删除程序”窗口，删除“添加或删除Windows组件”的选项里不需要的程序组件。系统中有些程序文件也是可以删除的，如Windows 2000的“C：\WINNT\driver cache\i386”目录下，就有一个大小约50多兆、名为“driver.cab”的压缩文件，这是系统内置的硬件设备驱动程序包。名为 “user.dmp”的文件会使电脑经常出错且用处不大，也可以把它删掉。这些不常用文件的删除方法同上一段落。
3.删除“系统还原”文件夹
Windows Me/XP的“系统还原”虽然提高了系统的安全性，但随着不断安装软件和创建“还原点”，其还原备份文件夹（_Restor）会越来越大，浪费了大量硬盘空间。还原备份文件夹删除的方法是：在控制面板中点击“系统”选项，进入其“系统属性”对话框里将“禁用系统还原”勾选，然后打开注册表编辑器（Regedit.exe），层层进入 “HKEY_LOCAL_MACHINE/System/CurrentControSet/Services/VxD”，在下面找到VXDMON主键，把它全部删除，重启后即可删除“_Restor”这个大“垃圾”文件了。
4.清除一些运行记录的垃圾信息
①清除“运行”列表中的程序名
使用Windows操作系统的“开始/运行”命令时，我们会发现它的“打开”框中有许多命令，这些命令并不是我们都需要的，而有些信息也容易暴露个人信息。如果要删除此处的垃圾信息，请在注册表编辑器中，依次展开“HKEY-CURRENT-USER/ Software/Microsoft/Windows/CurrentVersion/Explorer/RunMRU”。在该注册表的右侧显示出“运行”下拉列表中的信息，要删除某个项目，用鼠标右击名称，选择“删除”即可，注意不要删除“默认”和“MRUList”所在的行。
②清除“文档”菜单中的文件名
选择→→，打开“任务栏属性”对话框。在该对话框中选择“开始菜单程序”标签，然后点击“清除”按钮即可，这样“文档”列表中的内容就会全部被清除.
③删除启动配置文件
在Windows操作系统下，“Autoexec.bat”和“Config.sys”等系统启动配置文件，基本上已无用武之地，你也可把它们删除掉。如果不放心，不想删除它们，但为了系统更干净，启动更快，最好还是用记事本打开这两个文件，将其中的内容清空。
④删除Windows Media Player播放记录中的残留信息
使用时间久了，你会发现Windows Media Player的播放下拉框中列出了曾经播放过的文件列表，有的信息根本早已无用，将播放列表塞得满满的。删除此处无用信息的方法是，打开注册表编辑器，找到“HKEY_CURRENT_USER/Software/Microsoft/MediaPlayer/Player/ RecentFileList，右边的窗口就会显示播放记录，把这些键全部清除，即可把播放记录清除。
同样方法，我们还可以删除RealPlayer中的播放列表垃圾信息和ACDSee看图列表信息等。
5.删除软件卸载后的遗留文件
①删除软件安装文件夹
先找到并右击软件的快捷方式，选择属性，在常规选项卡中单击“查找目标”按钮即可快速找到软件的安装目录，如“C:\Program Files\Kuro\Kuro.exe”。接着，在资源管理器中，找到“C:\Program Files\Kuro”，并将它删除。
②删除“添加/删除程序”中的垃圾信息
通过“控制面板”中的“添加/删除程序”卸载某个应用程序，但有时卸载之后程序还在列表中，日积月累垃圾信息越来越多。删除方法：打开“注册表编辑器”，依次展开 “HKEY_LOCAL_MACHINE/SoftwareMicrosoft/Windows/CurrentVersion/Uninstall ”，则屏幕右边将显示出“添加/删除程序”中的所有项目，选中垃圾信息项目，右键单击该值，在弹出的菜单中选择“删除”命令即可。
③取消开机自启动
如果要删除的软件与Windows启动时一起启动的，那么在Windows 98/XP中，运行Msconfig，启动系统配置工具，单击启动标签，在其中查看是否有“C:\Program Files\Kuro\Kuro.exe”的链接，若有则取消即可。在Windows 2000中也可以这样做，只是你要将这个文件从Windows 98或Windows XP中拷贝到Windows NT目录下。
④删除文件关联项
在资源管理器中，选择“工具/文件夹选项”下“文件类型”标签，找到与“C:\Program Files\Kuro\Kuro.exe”相关联的文件类型，再按Del键删除。
⑤打开注册表，查找与卸载软件有关的键
打开注册表，利用查找功能，在注册表中查找与软件有关的键值，找到并删除，可能有多个，这时你可以用F3快捷键继续查找，直到所有的项目全被删除。
⑥利用专业清除垃圾软件
“垃圾文件清理器（FileClear）”是一个绿色的免费小工具，仅有335KB，垃圾文件清理器
下载后无须安装即可直接使用。
这款工具的界面相当简洁，运行速度比较快，具有以下特点：“扫描” 能将硬盘上所有与垃圾文件扩展名相符的垃圾文件找出来，一一列出，供选择是否删除；“备份”能将选中的垃圾文件备份到C:\backdel目录下，另外还有一hjl.bat文件，双击它能将备份文件恢复到原先目录下；“添加类型”可添加*认为是垃圾文件的扩展名，注意形式要与表中列出的一致；临时目录下文件指的是C:\windows\temp下的垃圾文件，一般可安全删除；上网缓冲文件指的是上网是产生的大量临时文件，一般下网后就成了垃圾文件，可以删除。
环保卫士是一个在Windows 95/98/NT/2000下运行的文件清理软件环保卫士
它的特点是可以由用户自己定义，修改所要清理的软件，而且不会在没有经用户允许之前删除任何文件，因而有非常高的安全系数。SafeClean 的使用界面非常友好，只要会使用 Windows，就应该会使用 SafeClean。SafeClean 支持多语言界面(当然包括中文)，可以在任何时候把界面修改成想要的语言。
DiskInfo 是一个配套的硬盘分析软件，它可以帮助你分析硬盘的使用情况，查找硬盘上最大的子目录，等等。SafeClean 的功能包括：查找并删除用户定义的文件格式；查找并删除用户定义的目录（包括Netscape和IE的Cache目录）；查找启动菜单和桌面上中断的快捷连接；进度总结随时汇报进展情况；多线程技术和更好的算法，加上了Undo功能，可以恢复错误删除的文件。
删除上网冲浪产生的临时文件上网时也会产生很多“垃圾”，这些“垃圾”包括上网历史记录、临时缓存文件、Cookies，如访问网址、登录用户名、密码或个人资料、身份识别等信息。
①清除历史记录
清除的方法是进入“控制面板→Internet选项”对话框，在“常规”页面中单击其“删除文件”和“清除历史记录”选项按钮，或者直接删除 Windows下的“Temporary Internet Files”文件夹中的内容就可达到清除垃圾的目的。此外上网时也会产生一些临时性的文件，还要到C：\Windows\Temp目录中把它们删除掉。
②删除地址栏列表记录
在地址栏的下拉列表框中会留有曾访问的站点记录，删除自己不想要的内容，可以用修改注册表的办法来完成。在“开始”菜单“运行”命令中打开 “Regedit”，即可打开注册表，依次展开“HKEY_CURRENT_USER\Software\Microsoft\ InternetExplorer\TypedUrls”，此键下的所有子键就是历史站点记录，找到不想要的站点记录，删除掉其内容即可。
③删除右键菜单中的垃圾信息
有一种新的源码，是在右键菜单中把自己的网站名字加上，在你用右键的时候就会出现在弹出的菜单中，虽然不影响使用，但长长的右键菜单也有碍雅观。删除的办法是：打开注册表编辑器，找到“HKEY_CURRENT_USER\Software\Microsoft\InternetExplorer\ MenuExt”，删除其中令人讨厌的网址，右键就不会再出现那些网站的名字了。
④利用3721上网助手（不推荐）
利用“上网助手”，我们可以删除系统运行一段时间后遗留下来的临时文件和各种其他不需要的文件，节省磁盘空间，提高运行速度，你可以在地址栏输
http://assistant.3721.com/?type=clean，进入上网助手页面。
“上网助手”可以实现隐私保护功能，它能帮助我们清除上网留下的网页信息（包括地址栏网址、临时文件、历史记录、您输入过的用户名、密码或搜索关键字等）。还可以将此项功能延伸至清除“开始菜单”中的最近使用过的文档记录、访问“网上邻居”时产生的信息等等.
转自爱好者论坛（IT、电脑知识交流平台；《电脑爱好者》官方论坛。）
http://bbs.cfan.com.cn
部分内容参考了爱好者论坛
<<电脑报>>
Here's How I Clean Up System Junk (Years of Experience)
1. Temporary Files Generated During Software Installation
Many software applications, when installing, first extract their installation files to a temporary directory (usually the Temp directory under the Windows folder), such as with tools like WinZip. Then the installation proceeds.
If there are oversights in software design or issues with the system, these temporary files may not be "temporary" after installation, becoming a bunch of junk on the hard drive. Often, they appear with the *.tmp extension.
During software operation, some temporary swap files are usually generated, such as backup files like *.old, *.bak created when some programs work, backup files generated by antivirus software or system software when checking the hard drive, etc.
Some help or tutorial files自带 by application software (often with extensions like.hlp), and redundant font files in the operating system. A large number of font files not only take up a lot of space but also seriously slow down the system and some graphics processing software. Additionally, the "System Restore" folder occupies a large amount of disk space.
Since most Windows software uses dynamic link libraries (DLLs), and some software is not very maturely designed, many software, after being uninstalled, often leave some folders, *.dll files, *.hlp files, registry key values, and various unknown small things on the hard drive, becoming genuine junk.
3. Temporary Files Generated While Surfing the Internet
When surfing the internet, the browser downloads some web page files to the local machine, not only occupying valuable disk space but also exposing personal privacy. Additionally, it generates basically useless "waste" such as browsing history, temporary cache files, and Cookies.
How to Delete Junk Files
1. Delete System-Generated Temporary Files
The junk generated during Windows installation and use includes temporary files (such as *.tmp, *._mp, etc.), temporary backup files (such as *.bak, *.old, *.syd, etc.), temporary help files (*.gid), disk check data files (*.chk), and other temporary files like *.dir, *.dmp, *.nch. You can use the system's "Find" function to find these "junk" files on the hard drive and delete them. Method: Select all these files, right-click, and choose Delete. The two temporary folders "C:\Temp" and "C:\WINDOWS\Temp" are also breeding grounds for "junk", containing only temporary files, which can be safely deleted entirely.
2. Delete Uncommonly Used Files
Enter the "Add/Remove Programs" window in "Control Panel" and delete unnecessary program components in the "Add or Remove Windows Components" option. Some program files in the system can also be deleted. For example, in the "C:\WINNT\driver cache\i386" directory of Windows 2000, there is a compressed file named "driver.cab" with a size of about 50+ MB, which is a built-in hardware device driver package. The file named "user.dmp" often causes the computer to malfunction and is of little use, so it can also be deleted. The method for deleting these uncommonly used files is the same as the previous paragraph.
3. Delete the "System Restore" Folder
Although Windows Me/XP's "System Restore" improves system security, as more software is installed and "restore points" are created, its restore backup folder (_Restor) will become larger and larger, wasting a lot of hard drive space. The method to delete the restore backup folder is: Click the "System" option in Control Panel, enter the "System Properties" dialog box, check "Disable System Restore", then open the Registry Editor (Regedit.exe), layer by layer enter "HKEY_LOCAL_MACHINE/System/CurrentControSet/Services/VxD", find the VXDMON key below, delete it all, and restart to delete the large "junk" file "_Restor".
4. Clear Some Junk Information of Running Records
① Clear Program Names in the "Run" List
When using the "Start/Run" command of the Windows operating system, we will find many commands in the "Open" box. Not all of these commands are needed, and some information is easy to expose personal information. If you want to delete the junk information here, expand "HKEY-CURRENT-USER/ Software/Microsoft/Windows/CurrentVersion/Explorer/RunMRU" in the Registry Editor. The information in the "Run" dropdown list is displayed on the right side of this registry. To delete a project, right-click the name and choose "Delete". Note: Do not delete the lines where "Default" and "MRUList" are located.
② Clear File Names in the "Documents" Menu
Select → → , open the "Taskbar Properties" dialog box. In this dialog box, select the "Start Menu Programs" tab, then click the "Clear" button. Then the content in the "Documents" list will be completely cleared.
③ Delete Startup Configuration Files
Under the Windows operating system, system startup configuration files like "Autoexec.bat" and "Config.sys" are basically of no use, and you can also delete them. If you are not at ease and don't want to delete them, but for a cleaner system and faster startup, it is best to open these two files with Notepad and clear their contents.
④ Delete Residual Information in the Playback Record of Windows Media Player
After using it for a long time, you will find that the playback dropdown box of Windows Media Player lists the file lists of previously played files. Some information is completely useless and fills up the playback list. The method to delete this useless information is to open the Registry Editor, find "HKEY_CURRENT_USER/Software/Microsoft/MediaPlayer/Player/ RecentFileList", the playback record will be displayed in the right window, clear all these keys to clear the playback record.
In the same way, we can also delete the junk information in the playback list of RealPlayer and the viewing list information of ACDSee, etc.
5. Delete Residual Files After Software Uninstallation
① Delete the Software Installation Folder
First, find and right-click the software shortcut, select Properties, and click the "Find Target" button in the General tab to quickly find the software's installation directory, such as "C:\Program Files\Kuro\Kuro.exe". Then, in Windows Explorer, find "C:\Program Files\Kuro" and delete it.
② Delete Junk Information in "Add/Remove Programs"
Uninstall an application program through "Add/Remove Programs" in "Control Panel", but sometimes the program remains in the list after uninstallation, and the junk information accumulates more and more over time. Deletion method: Open the "Registry Editor", expand "HKEY_LOCAL_MACHINE/SoftwareMicrosoft/Windows/CurrentVersion/Uninstall" in sequence, then all items in "Add/Remove Programs" will be displayed on the right side of the screen. Select the junk information item, right-click the value, and choose the "Delete" command in the pop-up menu.
③ Cancel Startup at Boot
If the software to be deleted starts with Windows at boot, then in Windows 98/XP, run Msconfig, start the system configuration tool, click the Startup tab, check if there is a link like "C:\Program Files\Kuro\Kuro.exe" in it, and if so, cancel it. The same can be done in Windows 2000, but you need to copy this file from Windows 98 or Windows XP to the Windows NT directory.
④ Delete File Association Items
In Windows Explorer, select "Tools/Folder Options" under the "File Types" tab, find the file type associated with "C:\Program Files\Kuro\Kuro.exe", and then press the Del key to delete it.
⑤ Open the Registry and Find Keys Related to the Uninstalled Software
Open the Registry, use the Find function to find key values related to the software in the Registry, find and delete them. There may be multiple, and then you can use the F3 shortcut key to continue finding until all items are deleted.
⑥ Use Professional Junk Cleaning Software
"FileClear" is a green free small tool, only 335KB. After downloading, it can be used directly without installation.
The interface of this tool is quite simple, and the running speed is relatively fast. It has the following characteristics: "Scan" can find all junk files on the hard drive that match the extension of junk files, list them one by one for selection whether to delete; "Backup" can back up the selected junk files to the C:\backdel directory. There is also a hjl.bat file, double-clicking it can restore the backup files to the original directory; "Add Type" can add extensions that are considered junk files, and note that the form should be consistent with those listed in the table; files in the temporary directory refer to junk files in C:\windows\temp, which can generally be safely deleted; internet cache files refer to a large number of temporary files generated when surfing the internet, which generally become junk files after going offline and can be deleted.
"Environmental Guardian" is a file cleaning software running under Windows 95/98/NT/2000.
Its feature is that users can define and modify the software to be cleaned, and it will not delete any files without the user's permission, so it has a very high safety factor. The use interface of SafeClean is very friendly, and as long as you can use Windows, you should be able to use SafeClean. SafeClean supports multi-language interfaces (including Chinese, of course), and you can modify the interface to the desired language at any time.
DiskInfo is a supporting hard drive analysis software, which can help you analyze the usage of the hard drive, find the largest subdirectories on the hard drive, etc. The functions of SafeClean include: finding and deleting user-defined file formats; finding and deleting user-defined directories (including the Cache directories of Netscape and IE); finding broken shortcut connections in the startup menu and on the desktop; the progress summary reports the progress at any time; multi-thread technology and better algorithms, plus the Undo function, which can restore mistakenly deleted files.
Delete Temporary Files Generated While Surfing the Internet
Many "junk" are also generated while surfing the internet, including internet browsing history, temporary cache files, Cookies, such as accessed website addresses, logged-in usernames, passwords, or personal information, identity identification, etc.
① Clear Browsing History
The method to clear it is to enter the "Control Panel→Internet Options" dialog box, click the "Delete Files" and "Clear Browsing History" option buttons on the "General" page, or directly delete the content in the "Temporary Internet Files" folder under Windows to achieve the purpose of clearing junk. Additionally, some temporary files are generated while surfing the internet, and they also need to be deleted in the C:\Windows\Temp directory.
② Delete Address Bar List Records
There will be records of visited sites in the dropdown list box of the address bar. To delete the content you don't want, you can use the method of modifying the Registry. Open "Regedit" in the "Run" command of the "Start" menu to open the Registry, expand "HKEY_CURRENT_USER\Software\Microsoft\ InternetExplorer\TypedUrls" in sequence, all subkeys under this key are the historical site records. Find the site records you don't want and delete their contents.
③ Delete Junk Information in the Right-Click Menu
There is a new source code that adds your website name to the right-click menu, which will appear in the pop-up menu when you use the right-click. Although it doesn't affect use, the long right-click menu is also unsightly. The deletion method is: Open the Registry Editor, find "HKEY_CURRENT_USER\Software\Microsoft\InternetExplorer\ MenuExt", delete the annoying URLs in it, and the website names will no longer appear in the right-click.
④ Use 3721 Internet Assistant (Not Recommended)
Using "Internet Assistant", we can delete temporary files and various other unnecessary files left after the system has run for a period of time, save disk space, and improve running speed. You can enter the internet assistant page by entering
http://assistant.3721.com/?type=clean in the address bar.
"Internet Assistant" can realize privacy protection functions, which can help us clear web page information left after surfing the internet (including address bar URLs, temporary files, browsing history, usernames, passwords, or search keywords you have entered, etc.). It can also extend this function to clear the recently used document records in the "Start Menu" and the information generated when accessing "Network Neighborhood", etc.
Transferred from the Enthusiasts Forum (IT, computer knowledge exchange platform; the official forum of "Computer Fan").
http://bbs.cfan.com.cn
Part of the content refers to the Enthusiasts Forum
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