I am currently an owner of an Ipod Touch 4th generation. I see you are having problems with your Ipod Touch, so I will try to find a solution to your problem.
- Restart the Computer. This sometimes happens to me when I keep my Windows 7 on Sleep, and I try to sync my Ipod
- Make sure you have the latest version of Itunes
Hope that helps!
If none of the above solutions work, can you please respond back ASAP as I will try to find another solution to your problem (This might even help others with the same problem!)