Is this a usb virus or an update?

Recently, when I insert a flash drive and open it a shortcut shows up first before I can proceed to my files. I didn’t mind at first but my cousin’s iPod crashed—all the files were deleted when he connected it to the computer and blamed the suspiscious ‘update’. I had scanned my computer several times with an updated free antivirus before this happened but didn’t detect anything. So is ‘update’ the problem?