I upgraded my video card from a Radeon HD 7750 to a Geforce GTX 660 ti.
After the upgrade Guild Wars 2 will often freeze on start up. It will go to a blank screen and then nothing will happen.
My specs are attached.
As these other kind people have suggested – start with a clean installation of your video card drivers, especially since you went from an AMD to an Nvidia card. I’d probably follow-up with deleting the local.dat file (should be in your Guild Wars 2 folder since you’re on XP) and then run a repair of the client.
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