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This video about how to clean up your windows easily. To delete temporary files:
Search for Disk cleanup from the taskbar and select it from the list of results.
Under Files to delete, select the file types to get rid of. To get a description of the file type, select it.
Select OK.
If you need to free up more space, you can also delete system files:
In Disk Cleanup, select Clean up system files.
Select the file types to get rid of. To get a description of the file type, select it.
Select OK.