I NEED HELP!!! (System Deletions)

Ok, Well, I downloaded Avast 4 Server Addition and it kept popping up: System 32 [Trj] and i selected delete, this was a bad choice because I didn’t know at the time that they were things my system need to run programs and other online things, like games. I don’t know how to un delete these programs…I can see every one that was deleted on the Avast! Log Viewer, but I can’t do anything to un-delete the items, SOMEONE HELP!!! >:( >:( >:(

I suggest to post the full paths/names of the files that were deleted.
(But if you really deleted them, and not moved to Chest for example, there’s no easy way to get them back.)