Slight problem (possibly because of TFD)

[MRMIdAS]

I was getting a box saying "one or more game executable's have been modified by a third party", now I've not installed any third party patches until ares, so this came as a bit of a surprise, ANYWAY, I've now got round to fully reintalling (just in case), and the error keeps coming up, even though it's a fresh .exe

I am using TFD, and was wondering if that was the problem?