Un-Install WinXP

I recently had a problem booting into WinXP, it wouldn?t let me repair the inst. so I installed another instance if XP choosing to install into C:\windows2. Now I have two installations of XP on my PC. How can I UNINSTALL ONE INSTALLATION, THE MORE RECENT ONE (WINDOWS2)? The origional inst. is the one I need and I already reapired it, so it works now, I no longer need the other inst. I can’t edit the boot.ini file so only the origional inst. of XP loads. This is really afrfecting performance and space. I really would like to uninstall the XP I don’t use.