Had some friends over, was upgrading my sneak while I watched them play other games, came back level 100 sneak did some missions, went to sleep. Next day I come on the game says "detecting graphics card" and sets my graphics to high with no antialiasing or anything, the game is always set to windowed mode, and set to 800X400 tried uninstalling the game and reinstalling using the disc, it didn't work still messed up, as in you can't change the resolution and graphics, and your data files is gone. When you load the game theres also the erased save data problem. I really hope this is a weird glitch and could be fixed later. If not that really svcks that I have to do that all over again. Also I downloaded the game using a disc not directly from steam.