1. Enter the computer (local computer) first, then click the system disk (usually disk C) with the mouse, and then select "Properties", as shown in the following figure:

2. We can click "Disk Cleanup", as shown in the following figure:

3. Then click "Clean System Files", as shown in the following figure:

4. Finally, check the "Previous Windows Installation" file, then click OK at the bottom, and then wait for the cleaning to be completed, as shown in the following figure:

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