Vista + Guild Wars Windowed Mode = No Go?

Ok, so I recently built a new comp. Here's the specs (dunno if any of these could be causing the problem, maybe the v-card)
E6600 @ 3GHz
2GB G.Skill Ram
eVGA 8800 GTS 640MB
eVGA 680i LT Mobo
Hiper 580 watt modular PSU
320GB Sata 3 HDD
Antec 900 case
19 Inch Samsung LCD (1280x 1024)
Vista Home premium
Guild Wars running in windowed/fullscreen 1280x1024 with max settings and 4x AA.

Basically what my problem is that when I run GW in windowed mode, after maybe 10-15 minutes Guild wars shuts down and it comes up with the prompt saying it crashed and to send an error log (which I do everytime). I run it fullscreen for over an hour or two fine though. Shouldnt be the temps since they all read 48 c and below, even with Orthos running (thats both cores at 100%). So I'm not having problems with overheating hardware. I'm thinking maybe it's just Vista or the the combination of Vista + My video card drivers...

Anyone have similar problems?

Check your drivers and keep them updated.

Besides that I have not experienced this problem and I to am a Vista User. The latest Nvidia Drivers are 158.24 and .45 for Beta I think... Something on those lines should sound right.

Aye, mine works fine (although i really do hate windowed mode in any game)

Works for me. Vista Home Premium.
Nearly the same pc, I run a GTX and 6700 though.

Seems that a few windows updates and updating my mobo drivers has fixed the problem... hopefully.