Problem quitting games

[emreggub]

I have a strange problem quitting some games(not all). On exiting some games the game hangs & the screen goes glitchy with the graphics appearing zig zagged looking like a series of small squares all over the screen resulting in having to press reset to quit.The games play ok but it's on quitting the problem occurs. I have a GeForce 7300 GS version 6.14 graphics card & an AMD ATHLON 64 processor 3500 + 2.2ghz and 1gig memory.Any ideas as it's annoying having to reset to quit.