How to completely remove the old file Windows.old from Win10 preview?

When the Win10 installation is completed, the old system files will be integrated into the Windows.old folder of the C drive, which occupies the system disk space. It is difficult to delete completely using the general deletion method, so it needs to be deleted by means of disk cleanup.

1. Open this computer &ld;;This PC”, select the C drive.

2, right click on the property and open it.

3. Click the "Disk Cleanup" button in the General Options.

4, wait for the disk scan, wait patiently for a while.

5. Click the “Clean System File” button in the lower left corner.

6. In the folder selection, check the installation file of the previous system and click “OK”

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