If it's just this one game that is causing you these problems I would return it. It isn't worth turning your system upside down for one game, at the risk of destablising it for everything else.
You could hang on for a later version of a patch, that might address these issues, assuming this is a common problem. But I would take it back, and buy it again, if these things are resolved in the future. By all means, keep check back to see if anything can be done. Larian tech's might be able to help you, but I assume you would need to give them exact error messages gereated by windows and the game.
