When accidentally deleting files, first rule is switch to another computer immediately so that the bit are not overwritten.
Ideally, you'd take the harddrive out and put it in an other comp where you'd install recovery software and then try to recover your files on that harddrive.

Why?
Because when you deleted a file, the OS only erases data that tells where the file chunks are stored. When that is done, any write to the drive might overwrite areas where your file once was.

For that very reason, file recovery works best with small files and when you react fast.

I think windows 7 has some kind of file versionning, don't know if that's useful for erased files.

I'm sorry I can only be generic and not really help you with your problem.