I just fell for the same thing. The saved game I think is stashed in the Users->documents directory. I could have sworn I took a copy of it before wiping the HDD. But alas not.
Ive lost my World In Conflict save too, and I was on the last mission of that. Oh well...
At least on Dirt2 Im kicking ass on the Rookie races even on Savage level, I think I might have to knock it up one more.