Yes, uninstalling will most likely fix your problem. Here is how you do it:
1) Start your computer with the install disk in the drive. When (presumably) the dell logo comes up. Press F12 (Or F8) Depending on your OS version.
2) A screen will most likely show up that says " Push any key to boot from CD" Do as is says. Hey that rhymes!
3) A DOS like screens (Quite ugly) That says " Setup is loading files..." will come up. This could take a while depending on your processor speed.
4) After all this, setup will ask you something like:
"Install XP" Press F1, or whatever it tells you to do.
5) Another screen will ask you what partition to install XP on. Select the one with the biggest number.
6) A screen may appear asking you if you want to continue. It also may say that a "Windows" folder is already on that certain partition. Say yes. F1 or something.
7) A license agreement will come up telling you a bunch of jibberish. Bypass that.
Finally it will copy all the files.
9)The real setup will come up, asking personal question (HRRM) :oRemember, it will come to a point when it will ask you for the installation type. Do a clean install. The rest will just present itself.