If it always happens at the same spot, it could mean it's caused by a corrupt file.

Perhaps give a file check a go via the PlayOnline Viewer, before logging in (though I believe this can now be also triggered via the new config utility).

I'd definitely also try the windowed mode (maybe windowed full screen). Unrelated to this issue, but I'm pretty sure that some Windows things (like the dimming of the desktop by the UAC) still crash the game in the real full screen mode.