Be aware that when you delete data off a storage media, there's never a 100% guarantee that you'll ever recover what you deleted. Depending on what was deleted, how it was deleted, where it was located on the drive, etc. you have a chance to recover it, but it's not guaranteed. There's a few free data recovery programs that you can try, however they have limitions when it comes to the size of data they can recover (ranging from 1GB to 10GB). I wouldn't get my hopes up in this situation, but you can always give it a try.
Free data recovery programs you could use;
- Recuva by Piriform;
- EaseUS Data Recovery by EaseUS (not the same as TsVk! posted);
Good luck with the recovery process
And in the future, try to make sure that you don't need anything inside a file, folder or drive before deleting it and/or make back up of your data frequently!