to Restore ipod/iphone / ipad plz follow below procedure.
Using the Restore function for your device is part of standard troubleshooting procedure. Restoring your device will delete all the data from your device, including songs, videos, contacts, photos, calendar information, and any other data. All settings are restored to their factory condition.
Whenever you restore your device, Apple highly recommends that you perform a sync prior to restoring to back up any changes since your last sync. If you have movie rentals on the device, see iTunes Store movie rental usage rights in the United States before restoring.
Use the following steps to restore your device:
1. Make sure you have the latest version of iTunes installed and running before attempting to update.
2. Connect your device to your computer.
3. Select your iPhone, iPad, or iPod touch when it appears in iTunes under Devices.
4. Select the Summary tab.
5. Select the Restore option.
6. When prompted to back up your settings before restoring, select the Back Up option (as seen in the image below). If you have just backed up the device, it is not necessary to create another.
7.Select the Restore option when iTunes prompts you (as long as you've backed up your device, you should not have to worry about restoring your phone).
8.Once the restore process has completed, the device restarts and displays the Apple logo while starting up
9.The final step is to restore your device from a previous backup. Once your device is restored and—in the case of the iPhone—in the process of activating.
Select the backup you want for your device and select the Continue button to complete your device's restoration.
If you do not want to restore from backup, select "Set up as new…" If you want to preserve previous backups that iTunes has made, be sure to back up the appropriate directory before choosing to set up as new.
iTunes puts the backup files in the following places:
On a Mac: ~/Library/Application Support/MobileSync/Backup/
On Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
On Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
i hope this will solve your problem..