Multiple Operating Systems

Hi, I had recenly installed Windows Xp on my laptop as a new install. I
had a problem with it, so I re-installed my previous OS, Windows ME.
Now when I try installing windows XP again, it says that multiple
operating systems are found. I think that part of Windows XP is still
on the computer from the install. If you could tell me how to UNINSTALL
the part of XP that is on there so I can install Windows XP again, that
would be great.

Also, When I boot the pc it DOES NOT give me a choice of what OS to
boot from, it just starts booting Windows ME. Thanks.