Archived from groups: microsoft.public.win2000.setup_deployment (More info?)
Depends on how far things went. Sounds like too far.
You can boot with your WinME startup disk and issue the command
this will rewrite the boot sector, then you can delete these files boot.ini,
ntldr, ntdetect.com, bootsect.dos, pagefile.sys and possibly ntbootdd.sys
from the root of the System partition C:\.