Because your system is normal, I studied it today. Just delete some useful folders in drive C, such as drivers, and then restart. The computer needs to use boot from CD (System Installation Disk), then enter the installation interface, delete drive C and rebuild drive C! The new system windows xp has been installed in this new C drive, and everything is normal. By the way, anti-virus software will delete your wuauolt.exe by mistake, delay the startup sound of your computer, make the automatic update of your computer fail, and make the browser unable to open the MP3 you listen to online. A voice driver said hello, can't fix it. At this time, you can only reinstall the system by the above method, but you can't overwrite the system.