Really? (maybe I'm wrong... )And you never answered #1 - or maybe THAT is what you are seeing when you get "Select OS" - NOT NTLDR but the Ubuntu Loader, which has BOTH OS'. You do know the difference between the two, right? Ubuntu will install a different Boot Loader ("GRUB") that runs BEFORE "NTLDR" or the actual Ubuntu (and which "points" to the Ubuntu OR WinXP to "select one"). "Control Panel->Remove" - is that in XP (which was question #3 that you never fully answered) or Ubuntu? 3 - Did it ever FULLY boot into the XP AND RUN when you selected XP after you installed? The only reference I've found is when you boot to the Ubuntu CD and select "Install Alongside" ("WUBI"). edit - and I found this thread. It really looks like your "pointers" and "loaders" (not to mention Boot Code) are messed up. edit2 - and also found this. Which means that what you suggest doesn't sound right at all. yes u r correct ... 3# ans. Yes ,,,before this problem i could boot in xp fully... & i installed ubuntu after xp3 ......(for ur info.) plz, ,tell me solution ,,,rather than discussing unwanted things.. u can tell me some steps ,,,to repair that xp3 file/folders ,,, so that i can login in my exising xp3 on my pc