What is Windows.old?
When you upgrade or reinstall Windows, your old files may be placed in a folder on the C drive, which is Windows.old, but this folder usually takes up a lot of space on the C drive.
How to delete Windows.old?
We can use disk cleanup tools to quickly delete this folder.
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Run (Win + R), enter
cleanmgr
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Select Clean up system files
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Check
Previous Windows installation files
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Finally, click OK to start cleaning