By any chance were you trying to set up to dual boot on a drive that already contained XP? I don't think that works and XP won't recognize the partition. You'll need to download and burn a copy of gparted which should allow you to delete the Linux partition. Of course you'll need to BU your XP data or, better yet, it's partition if you can.
i tried to install ubuntu but failed now i find i have lost 70g/b from my h/d, lost partion is not showing on my pc
origanal h/d size was 150g/b tried everything to try and find any help would be great,i`m a computer newbie.
original operating system is win xpwhich is working fine