Start=>Run=>cmd [Enter]  expand F:\i386\config.nt_ c:\windows\system32\config.nt [Enter]  expand F:\i386\autoexec.nt_ c:\windows\system32\autoexec.nt [Enter]  expand F:\i386\command.co_ c:\windows\system32\command.com [Enter]  Where F: the drive with ur xpsp2 cd in /sc