You might as well chuck the drive and start over. That probably is the best. Only other way is to run a drive write over program like DBan and then reinstall. See here:
Make the CD or floppy on a clean machine. From what I read, the ones infected with this had run a program like a keygen when the worm started up. Lesson learned the hard way.
avast antivirus detected virus(win32/virut)...i press delete all....after rebooting windows is asking for login and password..not able to open the windowsxp..what should i do?