Your PC is infected with virus
Download and install a good antivirus like NOD32 trial
Or AVG free
Then Update it
Restart the PC in safe mode
Connect all the flashdrives/External Hdds/Storages
Scan your full system including the external drives (If using NOD32 ->start NOD32 ->select all the drives ->click "scan and clean"
After the cleaning is done restart the PC in normal mode
downlaod this tool ->
http://download.sergiwa.com/security/RRT.exe
Start the tool and enable the regedit /folder options/ Task manager