Here is a link with slightly conflicting advice:
http://www.nibbleguru.com/probs/100/463

2) In step 4, DON'T use "fixmbr"! The sky will indeed fall down on your head!!

Very Easy: Boot from your XP or Win2000 CD and enter the setup mode. Then Choose to repair using Recovery Console. This takes U to DOS. Type a Command "fixmbr" and Accept then "Fixboot" and Accept. If this is done then Type exit and restart your system. After this make sure your AV programs are up to date and do regular scans

Further research opinions:
http://www.google.ca/search?hl=en&q=...G=Search&meta=



Be sure to read all instructions and select a conservative route, initially (without 'fixmbr').


Let us know how you make out.