I have this same problem. I can Alt-Tab any game but not Combat Arms.
i have 4gb of ram so i dont think thats a problem...
my old computer had 1gb and combat arms let me alt tab
just ctrl alt del XD or maybe your comp just suks
Ok, my laptop does this. all u gotta do is alt tab it so that it is on the desktop. Make sure it is on the desktop by clicking around on the desktop. then u gotta Alt Tab into combat arms once and hit enter. (at the . wait at least 30 sec- 1 min, it should go back in. In somecases combat arms will be half open, but u still see ur desktop, but a faint blue tab at the top of the screen saying combat arms. Just click on the destop area where u can end up seeing ur mouse and then alt tab back into combat arms. This might not make much sense, but im in a hurry and had to make it as short as possible.