That's very odd. I'm guessing it is an issue with your computer, rather than the game itself.
What I would recommend is that you remove the game completely. As in... remove save game data, just wipe anything F.E.A.R. 1 related from your computer that comes from the Install.
If it was a Steam copy, I could say "Verify Cache Integrity" to fix any problems but as for D2D, I'm not too sure. I know you have reinstalled it, but try removing everything and then having a fresh install. I'm sure the game does come with the 1.08 implemented, if not then apply the patches for your region. Then launch the game, set your graphic options, play the game for a while, save and close. Reload your game and check if the issue is still coming up.
I'll do some more fishing around to find out about how to solve the problem if it does arise again.
Look forward to hearing from you shortly, thanks for your patience.