Turn on your computer, and then click on the Windows "Start" icon in the bottom left-hand corner of the screen.
Click on "All Programs," and then select the "Accessories" dropdown menu.
Select "System Tools," and then click on "System Restore." Wait for the System Restore welcome screen to appear. Click on "Restore my computer to an earlier time." Click on the "Next" button to continue.
Click on the back arrow next to the calendar until you have reached the date you purchased or set up your computer. Select that date, and then click on the "Next" button to continue. Your computer will automatically restart.
Turn on your computer, and then press "F8" as your Dell Latitude is booting up to enter the "Advanced Bootup Options" screen.
Press the down arrow, and then select "Repair Your Computer." Press the "Enter" key to continue.
Select "English" as the default language, and then click on the "Next" button to continue.
Enter your administrative username and password, and then click "OK." Click on "Dell Factory Image Restore," and then click on the next button to continue.
Click on the box next to "Yes, reformat hard drive and restore system software to factory condition." Click "Next" to continue. Wait for the factory restoration process to complete, and then click on the "Finish" button to complete the system restore process.