When we re-installed the computer system, the new system puts the previous Windows installation files into a folder named Windows.old, which allows us to access previous Windows installation data. Usually the files here we are not used, and occupy a considerable amount of disk space, but the direct manual removal of many system files we do not have that permission to delete. Let's take a look at exactly how to delete it.
Open "My Computer", right click on the local C drive, select "Properties", open the C Drive Properties dialog box, under the General tab, click "Disk Cleanup", for example,
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The system accountant calculates how much space the C disk can free, patiently waiting for a while,
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Select "Clean System Files",
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Be patient for a while,
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Tick "Previous Windows installation",
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Prompt for permanent deletion, select "Delete File", for example,
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After a while you can see that it has freed up more than 10 g of space, such as,
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The Windows.old folder also disappeared, for example,
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Thank you!
Clean up the Windows.old file