Introduction to Windows Disk Cleanup Wizard
What Disk Cleanup Wizard does is locate files that can easily be removed to free up some disk space, especially files that may not be obvious to you, such as temporary files used by Windows or when browsing the Internet.

You can run the Disk Cleanup Wizard most easily by searching for disk or clean in the Start Menu search box. You can also open Disk Cleanup Wizard by clicking Start Menu, point to All Programs, point to Accessories, point to System Tools, and then click Disk Cleanup.

The main options present a list of check boxes that include the obvious temporary files and setup files.

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Clicking the Clean up system files button will reveal additional options . These can include “Windows temporary installation files” which, if you’ve recently upgraded the PC to Windows 10, can consist of the previous Windows installation files. Windows 10 protects these files for 30 days after the upgrade so it can be rolled back if necessary. However, they can occupy many gigabytes of space, on a small SSD or HDD storage drive, this can fill much of the available storage on the device.

Clicking the More options tab presents an option to clean up System Restore points. These reside in the System Volume Information folders that is hidden on each partition. Should System Restore become corrupt, deleting the restore points can reset it.

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If you want more power, flexibility, and control than the Disk Cleanup Wizard offers, the market leader in disk maintenance and cleanup is the excellent CCleaner, available for free.