Well, there's not an uninstaller for BT5--that's the bad news BackTrack is a specialized distro of Ubuntu Linux, and as you found out, it's quite different from a standard distro. Is this a dual boot install? If so, you could use something like gparted (you can find it on sourceforge) to just wipe out the BT5 install & reclaim all your drive space for your primary O/S. Also (against assuming a dual boot install) you may be able to use partition tools in your primary O/S to get rid of BackTrack that way. Good luck!