Can this be fixed??

well, i had everyting perfect and i screwed it up. i was showing my friend how to do an install over the current install b/c he didnt know about the repair console etc and now when i boot up, i have to choose between the two installations. im not sure why this happened b/c i've dont it many times. is there a way i can get rid of this new install? i tried system restore, but thats only for the install you are currently in. i also tried removing the entry from the boot.ini file and that screwed up everything to the point of me only being able to logon locally in safe mode and fix it, but i am back to two installs. can someone help? is there someway to remove the new install i did?

Sometimes I think I'd be better off dead. No, wait, not me, you.