I recently did a format and for some reason my black plague folder which I purposefully backed up, is gone. It had my save games, and I had just gone past the Chemical Labs mission. It took me some time to get here, so I was wondering if there's anyone with a save game they could upload, say just after the chemical lab?
As it just so happens, I have a few save files from the Chemical Storage, and this was the most recent one saved. I'm not sure where it is EXACTLY, but it should be close enough to where you were, even if you have to do a little backtracking.
--EDIT: I removed the zipped file, as it served its purpose