Hey, I know this is an old post, but I recently encountered the same problem that you had and after dozens of google searches across many months (or maybe years at this point), and many complete iTunes re-installs, nothing was working. So I decided to take matters into my own hands and try to figure out a solution on my own, and much to my surprise, I got it working! Here's what I did: It turns out my problem was that the 'USB Mass Storage Device' device in the Device Manager wasn't working right, indicated by a yellow exclamation point on its icon. So, I actually copied over the Windows USB storage driver from my other computer, which I never had any iPod troubles with. It's called USBSTOR.SYS. Here is my exact file: I navigated to the following directory on the computer that was having trouble: C: Windows System32 DriverStore FileRepository usbstor.infamd644e0e6d557dc3e4b a and renamed my current USBSTOR.SYS to something else, just in case this didn't work.
Then I copied over my new USBSTOR.SYS into that directory. Your directory is probably slightly different than mine, but the key thing to look for is that it will start with 'usbstor.inf'. Also, I'm not sure why there's a space between the 'b' and 'a' at the end when I paste it here; there isn't supposed to be one. Next, I went back to the Device Manager, right-clicked on the USB Mass Storage Device, and selected 'Update Driver Software'. Then I selected 'Browse my computer for driver software', then 'Let me pick from a list of device drivers on my computer'.
On the next screen, the new USB Mass Storage Device driver had been found, so I just clicked 'Next', and lo an behold, my iPod immediately popped up in Windows Explorer and iTunes! I was in shock! If this for some reason doesn't work for you, you can always revert back to your old USBSTOR.SYS by changing the name back, and if necessary, repeating the Update Driver Software process. I hope this helps someone else out there. Apple Footer.
Usbstor Sys Driver Download
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