Uhh heres a simple way to play your games in windowed mode..
1:Right click the shortcut icon on your desktop or start menu w/e.
2:In the target field add -window at the end of whatever it says. You need a space after whatever is in the field.
3:Click OK then your done..
If you want your game to be full screen again just erase the -window.
Also um if your game can't be played in window mode, it's probably your game. Unless the window mode trick doesn't work on any of the games you play...