If you upgrade your Windows 7/8 to Windows 10, or you upgrade Windows 10 to the latest version, you will have a Windows.old folder saved on your C drive. This folder is used to roll back to the previous version of your Windows. However, if you are satisfied with the current operating system, probably you want to delete Windows.old, which usually takes 10 GB around disk space.
So what we are going to talk about is how to delete Windows.old folder.
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