Hi,
If you formatted you would not have two instances of WinXP Home installed.
First, is there actually two working installations? Try both. If one fails,
then you can remove it by editing boot.ini manually, or by using the 'check
all boot paths' button on the boot.ini tab of msconfig.
If there are two full installations, boot to the one you wish to keep, then
delete the system folders for the other one. Again, to remove the reference
to the second installation at boot, use the msconfig button referred to
above.
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Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Associate Expert - WindowsXP Expert Zone
Windows help -
www.rickrogers.org