I've got a geforce 4600 ti w/latest drivers and doom3 locks up or goes dark after certain points or so long. Vampire Bloodlines also locks up. Should I keep trying old drivers or think about new hardware? I only have a 250w power supply so high end cards are ??? My audigy might be touble too. Can I really go to my grave without experiencing Doom 3, Half Life 2, or Vampire - Bloodlines?