I can run BG2 properly, as in the game boots up. But whenever I try to make/join a Single or Multiplayer game the game just crashes. Reinstalled once already anyone got any ideas on how to fix this?

Before you ask, yes I've tried running it on admin + Win compat mode with XP SP3

Only thing that springs to mind is to install outside Programs or Programs (x86). Choose a location such as C:\Games and see if that makes a difference.

I tried that too... installed into my D drive instead and same problem

Yeah, it was a long shot. Not sure what the issue is. I have it running (and modded) just fine on my Win7 64 bit rig and I can't think of anything I did that you haven't already listed (I installed in a different folder than the default, ran the installer as Admin, run the game as Admin, and run it in WinXP SP3 compatibility mode.)

Thx anyway... I'll try a re-dl of the file itself from GOG

Oh nvm! found a solution... Had to run the game in windowed mode!