I have a Dell E520, Pentium 4 HT, 2GB Ram. I beleive im running a 32-bit processor(Windows XP). I have a genuine Windows Vista Home Premium retail dvd. When I insert it into the PC and try to open the setup, it freezes and when I try to insert it and boot from dvd all I get is a black screen with a little _ in the top left. Can someone please tell me whats going on?