54Restoring Your Operating SystemWindows 7Click1. Start .Right-click2. Computer.Click3. Properties→ Device Manager.Right-click the device for which the new4.driver is installed, and click Properties.Click the5. Drivers tab→ Roll Back Driver.If Device Driver Rollback does not resolve theproblem, then use System Restore to return youroperating system to the operating state it wasin before you installed the new device driver.See “System Restore” on page 50.CAUTION: Before performing theinstallation, back up all data files on yourprimary hard drive. For conventional harddrive configurations, the primary harddrive is the first drive detected by thecomputer.To reinstall Windows, you need the following:NOTE: Your computer does not have aninternal optical drive. Use an externaloptical drive or any external storage devicefor the procedures that involve discs.Dell•Operating System discDell•Drivers and Utilities discNOTE: TheDrivers and Utilities disccontains drivers that were installed duringthe assembly of the computer. Use theDellDrivers and Utilities disc to load anyrequired drivers. Depending on the regionfrom which you ordered your computer, orwhether you requested the disc, the DellDrivers and Utilities disc andOperatingSystem disc may not ship with yourcomputer.