
My graphics card is an NVIDIA GeForce 7300 GT, and I've updated the drivers.
After I updated, the error didn't appear for at least three weeks, but then suddenly did today, after I thought I'd closed Guild Wars (the CPU process didn't stop, however, and the window stayed open, though black).
I didn't have any problems with Guild Wars until after I had to reformat the hard drive and reinstall GW after purging a virus from my system.
What could be causing this?