If you have virus then scan your removable device. Pick any antivirus like Norton, Kaspersky, Immunet Plus, Bitdefender, Avast, Avira etc. (if you don't have) and scan your removable device after attaching it to system. Virus will be detected and will be automatically removed. When virus is removed from your removable device, don't forget to scan your computer completely, so that every single virus is removed and you don't suffer from this problem again.