This seems to be a strange error which started last night. The game crashed suddenly while playing last night and then started to crash on startup. It seems to freeze at the menu although it stays tabbed, and if you click on it the following window appears:
I’ve thus far tried a clean reboot, checked the integrity of the cache, and am now considering uninstalling and reinstalling.
-OS: Win 7 64-bit
-Processor: Intel Core i3 CPU 540 @ 3.07GHz
-Memory: 8 Gigs Ram (Gskill)
-GFX: Nvidia GeForce GTX 560 Ti