WinXP loses SYSTEM file and can't start solution

Phenomenon: It is not normal when starting XP, suggesting that c:/windows/system32/config/system is missing or damaged. If you don't have access to the system regardless of the computer, but if you press the keyboard to start it, what is it?
The reason for this phenomenon is that the corresponding system file is lost in the registry, or the file is damaged. The reason for the loss and damage of such system files is nothing but the virus damage and the accidental deletion of optimized software.
If you are not willing to reinstall the system, you can try the small series, enter the console after entering the system, and then run
cd Windowssystem32config
ren software software.bad
copy Windows\ epairsoftware
Then try rebooting the system. If you have 360 ​​software installed, you can try to use the system first aid kit to recover the system files. After the system works normally, you need to use anti-virus software and Trojan scanning software to clean the system virus and Trojan.
Another way is to enter the PE system for repair