The wonderfull anti virus program called "Antivirus software" you should get one,their really helpful.just scan the external hard disk drive and cleaned.and
keep a scaning computer once a week then I have been recommended to avast.any one website go to download a antivirus to take run the application as well as solve the problem.safty.live.scanner it is usefull virus scanner of the your computer.then go to malware bytes.org and free virus scanner.All your pendrive flash folder corrupted shortcut virus bur your external harddisk first cleaned and virus is cleaned.