Try putting the Win2k CD-Rom into the drive and boot off of it (if your bios supports it), and select R to repair. Try letting it do it's automatic repair to see if it fixes the mbr. If it doesn't then use the recovery console (again boot of the CD-Rom) and then type fixmbr (I think that's the command) and fixboot at the command prompt. It's been awhile since I've used the Recovery console, so I'm not 100% sure of the commands.
If your BIOS doesn't support CD-Rom booting, then look for a command on the Win2k disk call makeboot.exe.
Hopefully this won't kill your ME install.