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Go to your desktop and click the "My Computer" icon. If there is no icon there, go to "Start," then scroll up to "My Computer." Open up your disc drive by pressing the button on the front of it. Once it opens, stick the DVD into it and close the drive. When the DVD drive closes, it should show up on the "My Computer" screen. It should only take a few seconds for the DVD-RW icon to pop on the screen once you close the disc drive. Clicking "Erase this disc" will bring up a separate screen. This screen should say "Ready to erase disc." Clicking the "Next" button will begin the process of deleting the disc. Wait until the loading bar is complete before closing the window. Your files should now be deleted off the disc.
Click the "My Computer" icon. Insert the DVD into the drive. Right-click the DVD-RW and left-click the "Erase this disc" text. Click the "Next" button.