EXIT DISABLED MODE IF YOU'VE NEVER SYNCED WITH ITUNES
Connect one end of a USB cable to your computer, but don't connect the cable to the iPhone yet.
Hold down the "Sleep/Wake" button until you see the red slider display, then slide the slider to power off the iPhone.
Connect the other end of the USB cable to your iPhone while holding down the "Home" button to turn on the device.
Release the "Home" button when the "Connect to iTunes" message appears on the iPhone's screen.
Click "OK" when iTunes displays a recovery mode message, then click "Restore."
EXIT DISABLED MODE IF YOU HAVE SYNCED WITH ITUNES
Connect the iPhone to the computer that you normally use to sync with iTunes, then launch iTunes. If you're asked to enter your password, connect the iPhone to another computer that you have synced with, or follow the restoration procedure in Section 1.
Right-click on the iPhone icon in the left pane, then click "Back Up."
Select "Restore" when the backup finishes to restore your iPhone and exit disabled mode.
Right-click on the iPhone after the restoration process completes, then select "Restore from Backup..." to replace your deleted content.
I hope my suggestion may help you out, Bruin !