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When you upgrade Windows, the system automatically creates a folder named Windows.old that contains the old data of the previous operating system, but it also takes up a lot of space. In the post below, I’ll show you how to delete junk + the Windows.old folder after upgrading Windows
Cleaning Up Junk After an Upgrade: How to Delete the Windows Old Folder
Step 1: Press the key combination Windows + R to open the Run dialog box. Type cleanmgr and click OK.

Step 2: Click Clean up system files; when a similar window appears, check the Previous Windows Installation(s) box (to delete Windows Old) and the other items, then click OK so Windows deletes the junk


Once it finishes, you’ll see that the used space has dropped significantly

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