i have tried a bit on my own, installed the 1.33 rc version, set graphics processor to the nvidia one - after some problems i got the game started in a part of my screen (still not fullscreen, guess thats what 800x600 should be), managed to switch on windowed mode. (startup methot c)
in windowed mode i was able to join all the servers but this occured on any of them:
http://pastebin.mtasa.com/267668168
please tell me how to fix this or if you need any further information