Run an extended hard drive diagnostic - F12 at powerup.
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If you cannot perform a Dell Factory Image Restore by pressing the F8 key whle booting up and choosing "Repair Your Computer" you will need to manually format and reinstall Windows.
This utility formats the operating system hard drive partition prior to restoring the factory image. This means data on that partition is deleted and cannot be recovered.
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How do i manually format and reinstall windows
How can I format and install OS manually ?