Ok I've found it, it does say to download the latest version of iTunes (but tbh if you already have iTunes, it prompts you to update anyway), so try this, open it up, and plug the iPod in.
If that fails, then try Restarting the iPod service:
- Quit iTunes.
- Right click on My Computer/Computer and click Manage. If Windows requires your permission to continue, click Continue.
- Click the plus symbol to the left of Services and Applications.
- Select Services listed under Services and Applications.
- Double click iPod Service in the right hand panel.
- Click the Stop button under the General tab and leave the iPod Service Properties window open.
- Connect your iPod and wait until it is visible in My Computer/Computer.
- Click the Start button in the iPod Service Properties window.
- Open iTunes.
If that doesn't work, reinstall iTunes, just to make sure that there isn't an error with the version (although, like said above, just install the latest anyway)
There's a bunch of other stuff that can probably done, which are on the apple site (I took the above from there) so if what I've said doesn't work then have a look and see if there's anything else that does.