Blue screen STOP error when booting

[Timbo]

Hi,  my son was downloading music the other day on our computer, he had installed a USB cord for his mp3 player to record it and after he finished, shut it down.  Yesterday, i tried to start it when i got home, and when it gets to the windows boot screen, in changes to a blue screen and says, STOP ERROR...you cannot access, you may have a virus.."  it then gives me a little instruction to fix, but each time i try to boot, even in safe mode, it keeps reverting to this blue screen before i can get to any antivirus applications or cursor..windows will not load for me to do anything even in safe...what can i do to restore my computer?  It's running Windows 2000, Pentium 3, 1999 model from Dell, deskpro.  ....thanks

[Deerpark]

Post the exact STOP error code you're getting and any files mentioned on the blue screen.

[evilfantasy]

It would be good to go to this post and scroll down to the HJT instructions and post that log also so someone on the malware team can have a look.