China DOS Union

I used a friend's computer to go online yesterday. When I logged in as administrator for the second time after booting, it always didn't enter the desktop. I selected the "System Restore" option in safe mode, but it seemed to have no response. So I restarted, and the result was that when logging in to the system, it automatically logged out immediately, and returned to the login window. It was a cycle of logging in -> logging out -> logging in!!!

It's an XP_sp2 system, and I don't seem to have changed anything. Oh my god.

There was a similar problem with the previous Win2000 system, but later I fixed it myself. Maybe it was caused by confusion after multiple adjustments to partitions, so that the Win2000 system couldn't recognize which one was the system disk. Later, I used DiskGen to rebuild the MBR and partition table, and somehow it was fine.

But I didn't change the partition table on this computer, and I finally used the USB boot disk to enter and saw that there was only one primary partition and two extended partitions. I tried the above method, but it was ineffective.

Have you encountered a similar situation?

Looking forward to the solution from the experts!!!
Thank you!!!!
(I'm waiting here for your reply)

Oh, no one is coming...

Please provide the content of the reply in the post so that I can translate it.

It is also possible to be related to the directory C:\Documents and Settings\ (for example, directory corruption, permission corruption, etc.) or other directories under this directory, such as Administrator, ALL USER and several other directories.

You can try this way:
Boot with an XPE CD, or hang the hard disk to another 2K/XP system, or use DOS4NTFS,
Anyway, as long as you can access the C drive, try renaming the "Administrator" directory under C:\Documents and Settings\ (or rename several other directories).

Okay, let's try. Thanks.

"Only one primary partition and two extended partitions?

Why are there two extended partitions?"

I encountered this situation before, and I can't remember exactly what caused it.
It seems that it was caused by me randomly deleting the registry or during optimization.
Later, fortunately, I had a CD drive and a Shenshan Hongye PE disk. I used it to boot into WINPE and then performed a restore operation on the registry of the local hard disk system. (Because I deleted a certain registry information at that time, which caused this phenomenon, so I knew how to restore it. Now it has been too long, and I can't remember.) Then it returned to normal.