Troubleshooting of automatic cancellation of XP System

I remember some time ago, my classmate asked me about the problem of automatic cancellation of the XP system. His computer was always shut down and restarted automatically. I checked it and did not implement it. Later, he told me that the computer was ready, re-install the system. this method is simple. I was on duty in the library yesterday, and many machines had such a situation. I was curious. Why? So I went to multiple parties to find information and solve this problem.
① The most useful method is to directly reinstall the system. ② the virus is destroying www.2cto.com MSN funnyvirus and damaging the normal userinit.exe, in the Registry, the Userinit key value under HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ WindowsNT \ CurrentVersion \ Winlogon is changed from C: \ WINDOWS \ system32 \ userinit.exe to C: \ WINDOWS \ system32 \ userinit32.exe,
In this case, we only need to use the winpeboot boot disk to enter the system, and paste the complete userinit.exe to C: \ WINDOWS \ system32 \ drivers to the USB flash drive to complete the above operations. After the COPY operation, WINXP can find the logon handler to log on successfully. After logging on to the system, restore the registry key value. (I have tried many computers successfully)
③ Local area network online repair (Remote Registry Modification): for example, execute strongxec.exe \ host name-user administrator username-p password c: \ windows \ regedit-s d: \ us with the xec.exein the pstools. regus. reg: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ WindowsNT \ CurrentVersion \ Winlogon] "Userinit" = "C :\\ WINDOWS \ system32 \ userinit.exe, "④