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yeah i used to get this. The way i fixed it was ctrl+alt+delete, then end the task explorer.exe, then click start new task. and type explorer.exe and thinsg return to normal.
Its a bug with some games as when they are excecuted aero is switched off when they are full screen, but sometimes windows just fails to activate it when you end the game.
I actually get a message from W7 64 bit to tell me that Aero is slowing the machine has been turned off. I just nit the restore button and alls well.
Can say I have never had this, although I do reinstall my OS every three months so to keep everything fresh.