geforce 5200fx was my old card. Its not going to stop doing that... sorry to say...
are you PCI or AGP? Might be dumb question... need to be sure tho.
Seriously 5200fx is an inferior card... And im not saying this to be a jerk, Im speaking from experience. ALL fx series kinda suck, actually.
You can get a good card for about 100 bucks on newegg right now... look for
ATI x1600pro - This is what ive replaced my old 52fx with, and it was well worth it in my eyes. I paid like $135 + shipping a few months ago... so like i said it could probably be found fr around 100 now.
you want to pay attention to the Rendering Pipelines... the Core/Mem speeds... and the BitBus size (x1600pro is 128 bus, which is good for GW) I would recommend finding a bus size 128 or better and make sure it has the new style shaders (fx has one step below the current 'good' shaders... meaning it will play the game, but not how its supposed to be)
No answer on the shiny one second/gone the next... used to happen to me too... Got sick of that card pretty quick
Nvidia has made some good progress on their drivers, however to be sure you are Cleaning the old drivers out first right? Otherwise thatll mess you up... you gotta wipe the old ones before you go new... a reason I dont really update my drivers every single time another one comes out anymore...