I suggest a fresh install any way cause sometimes during an install your pc could of coughed so to speak and that file it gave a error on might not of installed or somehow became corrupted during the install or even just missing. So just reinstall and then if it does it again, take it back to the store tell them what is going on and u wish to exchange it for another.
I had to do that before and they did just that for me.
I Have been using the Gamersgate version. The trainer works really well. Just the same problems that people reported, like companions that die pretty easyly, also the unlimited health does not work in fly mode (after 2 or 3 bumps, you die), and the unlimited jet pack booster only works on fly mode, not in hover mode. I dunno why the hate and low scores for DV. This game is fun. Kinda like the old rocketeer guy, mixed with stargate fiction. Pretty good. Thanks for the trainer Guys. Excellent work. :-D