First, you need to find the original installation disks that came with your computer. There's a Dell System Recovery disk that will wipe your computer and reinstall everything as if it had just come from the factory. Insert the Recovery CD, restart your computer, and press F11 or F12 to access the boot menu. When you get the boot menu, select the CD/DVD ROM drive as your boot device. This will lead you through the re-install process.
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First, you need to find the original installation disks that came with your computer. There's a Dell System Recovery disk that will wipe your computer and reinstall everything as if it had just come from the factory. Insert the Recovery CD, restart your computer, and press F11 or F12 to access the boot menu. When you get the boot menu, select the CD/DVD ROM drive as your boot device. This will lead you through the re-install process.