U could boot from all of them? Removed win 7 and 8, but after that xp didn't start normaly?
How did U removed win 7 and 8? Did U had them on separate partitions, and formated the win 7 and win 8 partitions? Or U had them installed on same partition which resulted in some sort of chaos? Or maybe have remaining files of previous installs?
If U can open your windows but loads default xp settings and desktop:
Try a system restore for your xp (start>msconfig>launch system restore)
Or more probably, maybe it couldn't load your user (maybe a corupted profile, which explains your xp default settings and desktop) and created a temp. Just in case, check the C:\Documents and settings\Your_user_name\Desktop to see if your files are still there. If so, make a new user and copy your old Desktop and My documents folder. (also, see if U have a temp folder in Documents and settings)
Still confused... If it DOES go into xp, then why do U want to edit the boot.ini ?
U usually mess with it if U CAN'T get into windows.