Hopefully someone can help me with an interesting problem.  A few weeks ago I upgraded an older Athlon system of mine with a new motherboard, processor and memory.  After a few days of driver and bios updates, I got everything to work well.  Also did a fresh install of Win XP.  Then a few days ago I upgraded the Video Card (from eVGA 5900 to LeadTek 7900 GT) and now one of my favorite games -- Dungeons & Dragons Online: Stormreach -- does not work correctly.  After playing the game for a few minutes, the graphics start looking corrupted and the problem keeps getting worse until the system crashes.  Usually I get a blue screen that indicates an infinite loop error in the graphics card and/or drivers, but sometimes the system just hangs.  The weird thing is that Serious Sam 2, which came bundled with the card, works fine, but Black & White 2 seems to be a bit slower, but hasn't crashed yet.  Also, 3DMark05 works fine, but 3DMark03 shows the same problem as D&D Online.  Another thing, once the image corruption starts, even if I exit the program before the system hangs, the problem keeps getting worse, even while I try to work with just Win XP, until the system hangs.  What is going on?  Is the card bad?  I'm working with the latest nVidia drivers and Audigy drivers, so the drivers can't be out of date.  Here's a quick summary of my system

MB -- ASRock 939Dual-SATA2 w/ most recent bios update
Sound Blaster Audigy ES card w/ most recent drivers
LeadTek 7900 GT (PCI Express) w/ most recent nVidia drivers (I think ver. 91.13)
Old card was 5900 (AGP) that worked just fine 

Any information would probably be helpful since I'm at my wit's end on this one.

John

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