When your Dell Latitude laptop becomes infected with a serious virus. the best way to repair it is by performing a fresh install of your Windows operating system. Performing a clean install means that you have to completely reformat your hard drive. This means that all of the data on your hard drive will be permanently deleted. You should back up all of your data before formatting your hard drive and reinstalling windows on your Dell Latitude laptop.
Turn on your computer, and then insert your Windows installation disc into your Dell Latitude's CD/DVD drive.
Restart your laptop while holding down the F12 key. This will open a window that allows you to choose how your computer boots up. Use your up and down arrow keys to navigate to the "CD-ROM/DVD-ROM" boot option. Press the Enter key to continue.
Delete all partitions on your hard drive. A list of available partitions will appear in the boot window. Use the up and down arrow keys to navigate to the partition you want to delete. Press the "D" key to delete each partition. Skip this step if your hard drive does not have any partitions. Press the Enter key to continue.
Select your desired file system format. For a clean install of Windows, the NTFS file format is recommended. Select the NTFS file system, and then press the "Enter" key to begin formatting your hard drive. The formatting process may take a few minutes depending on how much data is on your hard drive.
Enter your Windows product key when prompted, and then follow the on-screen instructions to install Windows on your Dell Latitude computer.