No actually it's not resources - you can limit that via configurations. It's just that for somereason it takes over 'full screen' mode - windows media player, all my dvd progams, games etc all can't go full screen with F@h running
Just a thought - but are you running anything in the background such as Folding@home by standford? I know I cannot play KOTR with that running, it will do the same thing.