Can't delete folder from usb drive

[Rameez Rajpoot]

I downloaded a video from Torrent it was working perfectly when i downloaded. couple of days later it said that that folder was 74 GB big when i only have 8 GB. when i opened the folder it had random folders inside which i did not make and they were named with some weird language. also i can't save anything in the folder and when i run a virus scan of the folder it says some files can't be scanned. I have installed windows 7 and Eset smart security 8.
I attached the picture of this folder.

[mnagaria]

i suggest the best option will be to take backup of any other data in that usb...and then format this USB. I had something similar happen in my USB and then soon it was all over my computer in the hard drive as well. So better to just copy any data that you have that you need someplace and then format this USB as soon as possible before it creates a mess for you