Guys, just a heads up.
Whenever you make a mistake like this, like format a USB drive, delete a file from the computer etc, just disconnect the drive, or turn the computer off.
It is NOT lost!
Nowadays you don't use "full format", because it's not necessary, and it isn't like the old XP format.
Full format on XP writes a zero to every little block of your harddrive (that's why it takes so long), while Vista/7 just scans the whole drive, to make sure that all the blocks on the drive can be read.
When you delete a file, you "mark" the file, or the blocks as available. It is NOT gone before you overwrite (that's why I'm telling you to turn off the computer immediately).
If it's a USB-drive, you'll most likely not have anything writing to it, so you can use the same computer. If it's your computer harddrive, you have to use another computer, or boot from a CD, so the operating system doesn't start using the space where you just deleted a file.
I have had a lot of good results with Easeus Data recovery and partition recovery (partition is free!). I've restored a lot of files for friends (I work with IT), and I have allways got 100% back.
Just try it before you starting doing a lot of uneccessary work
And guys... Backup! SynkBack is highly recommended (Free), although SE version is easier to use, and it's easier to exclude folders etc. I thinks it's $20 or something.
Btw; I'm not trying to advertise or anything, I'm just sharing my experiences!
PM me if you need some help restoring files. I will be happy to help!