You need to scan your whole system, not just the USB device. If your computer has some malware, it may well try to spread itself by infecting all removable devices that get attached to it, which may explain why you are finding that your USB device is constantly infected even though you have cleaned it.
Other useful free scanning programs that you can download and try out are MalwareBytes AntiMalware and SUPERantispyware.
To add to Dezaxa's comments, take some time to work with SFDC's S.M.A.R.T. group.
Follow directions and guidelines precisely and please don't try to work on
the issue through multiple channels. It makes the task impossible for us as
we have no idea what others recommended or changed.
Our team is the best and will get you back and running.
You need to scan your computer with any strong antivirus. I will suggest you kaspersky antivirus to remove the virus from USB. It gives the best protection and remove the all types of virus, malwares and worms.
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