I think I've found the problem, but I don't know how to fix it... I downloaded GTAINSTALLER.zip from RockStar Games' website, and extracted it. Now when I right-click on GTAINSTALLER.exe (or select it, then press delete) the whole pc freezes... I don't get a blue screen, I just end up restarting the computer. Is there a way to erase a partition? (I can part with all the rest of the files on it if only I could get rid of it.)