USB Mass Storage Devices Not Recongnized

When I Plug In My Ipod It Dosen't Show Up In My Computer. When I Look In Device Manager It Says That The Ipod Is There, But I Still Can't Access it. But Under That It Says USB Mass Storage Device And It Has A Little Yellow Triange With A " ! " Inside Of It. When I Open Up The USB Mass Storge Device Properties It Says
"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)
Click 'Check for solutions' to send data about this device to Microsoft and to see if there is a solution available."
I Click "Check For Solutions" And Nothing Comes Up. Also I've Tried Updating The Driver And It Says Driver Is Up To Date, But The Problem Still Isn't Fixed. I'm Really Clueless About What To Do So Please HELP ME!!!