It is me again asking for some help this time it is nothing big, I think.

I dual-booted my brothers system and his installed all of the proper drivers and is just fine. But there is only one real issue, and that is when I move a program or windows explorer box it lags and I don't have a clue why. Video games, fine. Programs, work just fine. Dragging a box, major lag. Resolution 1024x768. Colors 32bit. Yes this systems was vista first and the Win XP was installed on a partition. Hopefully this isn't a big job to try and figure out what is wrong otherwise I think I'll go to a tech forums, and try to fix this minor annoying issue.