Windows 7: Please Help, My Pc always minimize when playing Game

hello.. i had a problem with my PC.. now every time i'm playing game it always minimize to desktop.. like there something that plug to usb slot. i have unplug all usb device, and stop all running service and it keep happen.. sometime a ballon pop up and sound like "you running on slow graphic memory please change you visual" , i have no idea whats wrong with my pc..



and my spec is

amd fx 4100
asus m5a78l-m
4 gb corsair vengeance
his hd 6670 1gb ddr 5
250 gb sata hdd

thank you for your help..

Try this;

Right click on the shortcut for the game(s).
Click on properties.
Click on the compatibility tab.
Select disable desktop composition.

See how that works and let us know.

not work too, and i think there are running program but its only run for 1 second and after that dissaper.. and im already scan my pc for virus and the result is clean without threat..