usb problem all folders became .exe files and became hidden

i had i problem with my usb that all folders in the usb's root folder vanished and replaced by .exe file

a ran a avast scan and it came up with all of the folders name with .exe extensions it was W32.sality
it deleted the .exe files and the remnants are only file on the root of the folder
and i can access it by inputing in the address bar the location of the files

i ran the avast av scan it came up with nothing
i also ran a eset av scan on a different computer it came up with nothing

i may pick it up from a different computer excluding the computers i use in scanning it

can i still restore it to its previous state or will go in reformating it because i still need the files in it i did not get the files because the fear of getting the malware (i think) on it

 

Thanks but what should i do with the quarantined files should i delete them
but i reformated it though