Snotnarok said:
I know you're looking for answers and all but Google really would benifit you far more than asking on a forum.
If you typed your question into google you would have your answer faster and far more fixes for a wider range of problems.
As it stands, go directly to the Deus Ex folder, delete the Deus Ex folder, have steam re-install, and if not google the problem.
I'm not trying to be an ass, this would just help you better and get your answers faster. Hell youtube might even have the answer.
Well I appreciate the help and advice, but I have tried every solution that I've been able to find on Google, the Steam forums or other websites and forums, and nothing has worked.
So I'm done. I've had it. Tried the solutions, it won't launch at all, the game is just broken (or at least the exe file or something is broken). I mean, I'm able to run The Missing Link DLC just fine, but not the main game, so I doubt it has anything to do with driver updates or any kind of system requirement update. I also doubt it has anything to with the anti-virus blocking it because it it was that, I'm certain that the anti-virus or some other program would have let me know because it always does whenever I launch Killing Floor (Kaspersky believed it had keylogging software in it, can you believe that?).
So that's it, I guess. I'm not sure there's anything else I can do since I've tried everything to get the game to work. Might as well un-install the game and be much better off buying it for the 360.
Thanks for your help guys. I really appreciate it, but I'm afraid this time it has been unsuccessful.