Can I restore my rank level back to where it was before a hacked Modern Warfare 2 server changed it?

Solution 1:

There is just one thing...if you are running on OS that back-ups your files you can roll-back to a date prior to the hacked lobby.

My account was hacked too, i tried everything on the steam forums and the only thing that did work was going back to level 1, no prestige. Unfortunately i ticked off back-up.

I'm sorry that you had to work on your 3rd prestige and be hacked.

EDIT: if you want to try something look at the solutions posted here: http://forums.steampowered.com/forums/showthread.php?t=1297234

I've tried most of them but as i said they didn't work out, except the one where i could go back to level 1 without reinstalling my copy of MW2.