I had this problem, but came apon a solution..sort of.
Get yourself a cheap video capture card, get yourself a cheap games console (Gamecube+3 new games+4 old Zeldas=£99), and run the games console though your Video capture window
I now play games all the time when doing DB or 3DS Max work without any problems. In fact, for 3DS Max its particularly good, as the capture software hardly effects rendering time at all.
"The man who says it cannot be done is generally interrupted by someone doing it." ~ Elbert Hubbard
