If there is an easy way back it will be in the Add/Remove programs in the Control Panel. If not, you get to check that your backups are current, usable (they work?) and then install Windows ME from scratch.
However, I think this is a great forum to find cures for the issues. If they want, toss a few out for discussion.
I'm asking for a friend. She upgraded Windows millenium to Windows XP. She's having a lot of problems and now wants to uninstall XP and go back to using MN. Can anyone tell her how to do this?