I see, you should be able to re-download reinforcements as well and install in the ArmA 2 Directory. Then after you've patched it up to latest (Note patching with latest 1.59 patch, will patch ArmA 2 to 1.10, OA to 1.59, BAF to 1.02 and PMC to 1.01). After doing all that you should the add all the mods back into your directory and try again.