You got hit by a malicious script in a web page. I suffered from it before too, but I took care of it in 15 minutes! Specifically, you should do this:
1. Change the IE start page back. If the malicious web page still opens automatically at certain intervals, that means there is still a malicious program running in memory. At that point you should open Windows Task Manager, find the suspicious process of that program, and force it to end.
2. Open the registry editor and go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run. Check whether there is any suspicious program auto-start entry there, and if there is, delete it.
3. This still may not be enough; when you do something, do it thoroughly! We also need to check the Windows system configuration files. Find the file “Win.ini” under the Windows directory and open it. At the beginning you can see the following two lines:
load=
run=
These are also auto-start entries. If there is a command line after the equal sign, then Windows will automatically run the specified program when it starts. Under normal circumstances there should be nothing after the equal sign. If there is a command line there, then it is very likely a trojan. So if there is a command line after the equal sign, you should delete it too.
After the above three steps, the malicious script in your system will have been completely cleared out. Finally, don't forget to restart the system! But I suggest you also completely delete the files related to the malicious program from the system directory, so as to clean everything up.
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