Hi
I was having the same problem for ages. I followed a apple advice section telling me to check the processes for apple mobile device manager, and check for the applusb.sys driver, and they were both there and working. I would advise you to do this. If they are not showing, then the article says to re-install itunes. here is the article by the way.
http://support.apple.com/kb/HT1852
However this did not fix my problem. So I decided to try re-installing the actual driver, instead of the whole of itunes. Try this, as it worked for me
(I don't no how good with computers you are, so I'll put simple steps, sorry if it seems patronising!)
1) Go to start, and Run
2) Type "devmgmt.msc" without speech marks
3) A screen with your computers name at the top, with seperate sections for things like keyboards and moniters should have come up. At the bottom you should see Universal serial bus (usb). Expand it and look for apple ipod, or somthing similar (there's prob only be one by apple) If it's not there make sure your ipod is plugged in!
4) Right click and go to properties
5) Click the 'Driver' tab
6) You should see 'Roll back changes' as an option. Click that and accept/press yes to the prompts that pop up.
7) Wait for a few seconds (may take a min or two) until your back to the previous screen described in step 3
8) Now Under 'portable devices', apple ipod should be listed. Right click that, and choose 'Update driver software' Choose to automatically search.
9) Again wait, and when it's complete Apple iPod should show under universal seriel bus (usb) section again.
10) Exit out of device manager, and open up itunes. Your ipod should now be there. You may need to un plug it and plug it in.
What this effectivly does is re-install the device used to search for iPods by itunes. For some reason, mine and probably yours ran into problems.
Hope you found this helpful, and I'll check back later if you have any problems or questions.
Andy
Message was edited by: madworld14