Try fdisk_/mbr using a space in place of the underscore used here, which will rewrite the Master Boot Record, and try booting to an emergency rescue disk you hopefully made for your virus scanner. If a virus caused it, that may find it.
If at first you don't succeed, skydiving is not for you!
Note: Please post your questions on the forums, not in my email.
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[This message has been edited by Paleo Pete (edited 01-16-2001).]