I happened to use a Ubuntu 8.10 disk, but any linux should work. Boot off the linux disk and, in the Ubuntu case, choose the first option. It says something like “Try Ubuntu without changing my hard disk”. Once you have the os loaded, open a terminal. (I don’t remember where I found it, but it’s on one of the menus.) In this terminal, enter:
sudo fdisk -l
This will show you your hard disks. Ours came up as /dev/sdb1.
Then fix the mbr with:
sudo lilo -M /dev/sdb mbr
That’s it. Just reboot and windows came up.