152 Troubleshooting8 Select the Yes, reformat hard drive and restore system software to factorycondition check box.9 Click Next. The computer is restored to the default factory configuration.10 When the restore operation is completed, click Finish to restart thecomputer.Using the Operating System MediaBefore You BeginIf you are considering reinstalling the Windows operating system to correct aproblem with a newly installed driver, first try using Windows Device DriverRollback (see "Using Windows Device Driver Rollback" on page 144). IfDevice Driver Rollback does not resolve the problem, then use SystemRestore to return your operating system to the operating state it was in beforeyou installed the new device driver (see "Using Microsoft Windows SystemRestore" on page 154).NOTICE: Before performing the installation, back up all data files on your primaryhard drive. For conventional hard drive configurations, the primary hard drive is thefirst drive detected by the computer.To reinstall Windows, you need the following items:• Dell Operating System media• Dell Drivers and Utilities mediaNOTE: Your Drivers and Utilities media contains drivers that were installed duringassembly of the computer. Use your Drivers and Utilities media to load any requireddrivers, including the drivers required if your computer has a RAID controller.Reinstalling Windows VistaThe reinstallation process can take 1 to 2 hours to complete. After youreinstall the operating system, you must also reinstall the device drivers, virusprotection program, and other software.