Explorer.exe is a required system file.. the other system files infected were probably required to boot.. either your virus scan deleted these files for some reason or you screwed somethn up when you rebooted it.
You say the hd is detected in the bios, but Microsoft does not recognize the hd? That's rather strange.. perhaps the hd would be corrupted and you would be forced to reformat, but I'd think it would still be recognized by the XP cd.. Try using the XP cd again to repair your Windows installation.. if this still doesn't work then you will need a linux live cd to diagnose your hd..
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