I use Active@ Partition Recovery. You can make a backup of the MBR of each of your hard disks to a floppy disk
Windows XP cd has a utility to restore the MBR but I don't think it has one to back it up afaik. Boot from the cd, enter recovery console and type fixmbr
. That command restores the master boot code without destroying the partition table already in place.
If you boot Linux with grub then it may help to make a boot disk just in case;
1. boot from the linux cd enter rescue mode by typing linux rescue
at the boot prompt
once you get a command prompt, type
after that you can leave windows boot record on the mbr and always boot linux from the floppy disk.
Hope this helped