Sounds like a major issue with your video card drivers. Are you using an
NVIDIA card? I'm using Vista x64 with an ATI x1900 and Guild Wars plays just
fine for me. Maybe there is a new driver update or hotfix for your card?
Doesn't it bother you, though, that if NCSoft ever went under or decided to
turn off the Guild Wars servers that you and I wouldn't even be able to play
locally? I never understood that. They should have put in a single-player
mode like Diablo 2, IMO.