Unfortunately Vista miiiiiight be to blame..not Vista in /general/, but Ultimate edition...I hear it runs poorly compared to the other versions.

First, simple test: Go ingame, type /console maxfps 80, any change?

If yes: lol

If not: I hear the AMD quads aren't as good as Intel's...but that shouldn't make such a horrible horrible framerate occur. Rest of the system looks like it should run great, better than mine...

Try disabling or turning down AntiAliasing or setting it to Application-Controlled in the nVidia Control Panel at rightclick desktop > Properties > last tab > Nvidia tab; you want performance, so eff the slightly less-sharp but blocky no matter what textures in favor of reliability :p

Also, what resolution are you running? LCD/CRT monitor? MonitorS?

UI only affects load time most of the time, shouldn't affect fps much. Shatt however may be a bad place to test since 2.4 sunwell dailies have people gathering there en-masse in an already over-NPC'd area...adding a half dozen NPCs to the literally 50+ already there, beside the 2 battlemaster spots and fucking flightpath no less where there's hundreds of players sitting there like dumbfucks for their welfare epics instead of queueing and moving away from the lag like a sane person...doesn't help anyone's framerates let alone a boxer's lol