my iPod wont restore it has error code 1600

Error 1600, 1601, 1602: Try the following steps to resolve this error:

1. Ensure proper USB isolation troubleshooting has been performed, and test with a known-good cable.
2. Follow the steps listed for Error 1604.
3. This error may be resolved by disabling, deactivating, or uninstalling third-party security, antivirus, and firewall software. See steps in this article for details on troubleshooting security software.

Above from:

http://support.apple.com/kb/TS3694#error1601

Try restoring your iPod. Forst from backup and if problem persists restore to factory defaults/new iPod.

Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article to resolve this issue.

Above from:

http://support.apple.com/kb/TS3694#error21

What firewall and antivirus are you using?