I just purchased a new gaming computer and installed Galactic Civilization III with all updates and DLC via Steam. When playing, I noticed that factories did not appear in the build que for colonies, even after I researched the technology to have them upgrade to megafactories. The Megafactories do not appear either. There may be other elements missing that I have not yet noticed, but factories are reasonably important. I exited and ran a verification of the game files and it states that 4 files failed to validate and would be reacquired. It does this, and when I immediately run file validation again, I get a message that all game files validated successfully. When I start the game again and try to play, the situation repeats - no factories and 4 files fail to validate and have to be reacquired. Something about starting the game, big or small, seems to corrupt the four files. 

I've removed the game and completely reinstalled, but the problem immediately returns.

Any suggestions? My next step would be to remove modules of the DLC one at a time to see if any of those are the issue. Could there be an issue with the order the DLC is installed?

Thank for any assistance anyone can provide.