I thought I was being slick and I barrowed my sisters full version of Windows XP that she had just got. I have Windows 98 and really wanted to upgrade to Windows XP. I thought I could get around the full version of XP instead of using just an upgrade. After I loaded it I found out that it couldn't load XP all the way because I already had an OS, so now I have 2 OS on my PC! When my PC boots up it asks what OS I want to use but it can't complete the XP install and now I am stuck with all the software and can't even use XP !! What do I do to get rid of Windows XP so I can have my computer back? If I buy Windows XP upgrade and install it will it fix the problem and override Windows 98? I am not all that great with computer lingo so please speek in terms I can understand. Thanks a million!

Please see this thread, or this thread. They both deal with the same problem as you are having.