Step 1: Run CMD as administrator.

Step 2:Type F: and press "Enter".(Replace F with driver name)

Step 3:Type attrib -s -h -r /s /d * * and press "Enter".

Step 4:Type dir and hit "Enter".Now you will see all the files under the assigned drive.

Step 5:For your information , a virus name may contain words like "autorun" with "inf" as the extension.Thus, if you find such suspicious files,type del autorun.inf to remove the virus.