
1. Go to start type and open “Disk cleanup” select “C” and “ok”
2. Wait while it calculating, after this you will get disk cleanup window, click on “Clean up system files” select “C” and “ok”
3. It will scan and calculate so wait for it
4. Now find and select “Previous Windows Installation” and click “ok”
5. Wait to complete clean up and that’s it, the windows.old folder will be deleted from your C drive
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