I’m going to guess that USB is infected.
Download MCShield from Here. It will come in handy.
THEN
Go Here
Download and Run: OTL, Malwarebytes Anti-Malware & aswMBR
Attach the following log files in your next reply.
- OTL.txt
- Extras.txt
- aswMBR.txt
- Malwarebytes.txt