i have a visiontek geforce 2.  hmm, well, my ram shouldn't be a problem, cus these games never used to crash on my old system.  my old system used this stick of ram too.  but, i think i might of figured out my problem.  my modem driver causes MW 4 to crash once in a while.  once i get rid of the systray applet, i don't freeze.  but giants still kicks me out to the desktop.