Unplayable

I played the beta and I purchased it day one, I have not been able to play since the first month release. I have tried a zillion things and nothing is working. Before I would get into a match and halfway through the game would crash and then it started crashing my entire PC. Out of frustration I uninstalled it and said I was never going to play it again and it's been made very clear to me that I will not be getting a refund for it. I've had a hankering to fly some stuff so I begrudgingly re-downloaded it and now I can't even open the game without it crash crashing my entire PC. At this point I don't know what to do and it's not like I have a cheap computer either. I guess any help would be nice, otherwise I'm going to uninstall it and never touch it again.