If the folder has been accidentally deleted, then it may still be on your hard drive but not visible to you. First, try not to use the computer if avoidable as you may just be overwriting the space containing your folder info.
Google for and download one of the following recovery programs which allow you to see what is on your hard drive.
The folder/file name may be starting with a different letter/number but you will probably still recognize it.
Use the instructions in whichever recovery program you are using to undelete the file or save it to another folder of your choice.
Recovery programs = 1. Fast File Undelete, 2. Rest2514, 3. Recuva.
Good luck.