Hi J_e!!
It seems like your hard drive has infected before, but the infections already cured. But it might left behind the autorun file. Ok, here is the steps you might try on your computer.
Click
Start, click
Computer
Press
Alt on your keyboard
Click
Tools, then
Folder Options
Choose
View tab
Change the settings to:
>>> Choose
Show hidden files and folders
>>> Remove checkmark from
Hide extensions for known file types
>>> Remove checkmark for
Hide protected operating system files (Recommended)
>>> Click
Apply and
OK
Now,
right click on your external drive and choose
Explore. Can you locate any file with "Autorun.inf" name. Delete this file.
Disconnect your external drive, and reconnect it back.
Try to double click on it now