Windows XP was attacked my a virus, I got a green screen. Ran Spybot 3 times removed numerous files. It would no longer connect to internet so could not get updates. Opened in safe mode but could not scan from there. Re-booted system than it got worse. Message states "System32\Drivers\ntfs.sys" file missing or corrupted. Followed instructions using Windows XP disk pressing "R" to use recovery program. Renamed file .old and copied from Cd. Same result. Copied another ntfs.sys file from another XP machine, again same result. The file is there and it's from a clean machine. How to I get windows to reboot???? Help