I spent a full one hour on this thing just because of an update to the latest iTunes version @#$!@$%. I’m sharing what I have found that solved my problem and I hope it could help others as well because it was really a pain in the neck.
Reinstalling the “Apple Mobile Device USB Driver”.
Open Control Panel (Win+Q, search for Control Panel in Windows 8)
Search for “Device Manager” and open it.
Look for “Apple Mobile Device USB Driver” either under Other Devices or Universal Serial Bus controllers.
Right click on that and “Update Driver Software”
I chose to browse my computer and went to C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers
I picked the file usbaapl64 and installled that.
My iPod appeared in my iTunes Devices list again. Boom.
Mind you, before I found this solution I did all the uninstall, reinstall, delete Temp stuff and Googled my eye off for possible solutions to try. This worked for me. I hope it does for you, too. Or better yet, you didn’t get any trouble at all. Lucky you.