Crashing After Server Select Screen

[TicklePants]

Ever since I built my new PC and switched from Windows 7 to 10 I've had nothing but headaches with getting p1999 to work. The ONLY time I can get it to work is with a fresh install, and it only works for one login. If I close the game and try to go back into it, the program stops responding after the server select screen...which makes absolutely zero sense to me. I've tried everything, it seems: service pack 2, run as administrator, change DPI settings (since I'm using a 4k monitor), reinstalling onto each of my four hard drives...this is pissing me off so much. I'm at a loss.

Anyone have any ideas?

Thanks!