First question...have you emptied your Recycle Bin? If not, you're in luck, because it will still be there.
If you have....next question, do you have System Restore? You should be able to restore to a point before you deleted the files and retrieve them.
If neither apply, sorry, but that's as far as my knowledge goes. But, there are some experts who may be able to retrieve lost files. You may need to find them where you live, and they may be expensive.
It's a bit late now, but my advice is to back up to an external hard-drive every day.
Hope you get your files back,
Leonie.