Two things that are reported to work:

1)Boot w/ win98 boot floppy, at the a: propmt enter:

fdisk /mbr

2)Boot w/ XP or WIN2k cd into recovery mode and run:

fixmbr
Yes, those will restore your original MBR... and sometimes the mapping from the MBR to the boot sector is messed up, too, so these two commands also help:


Addition to #1: sys C:

Addition to #2: fixboot