Go to "This PC" and right click on your C: drive and select Properties. Select "Disk Cleanup" and then "Cleanup System Files". You can choose all the options and it will clean up your old windows install and any extra install and windows update files. Gave me an extra 28GB of space.
That's of course if you don't plan on going back to Windows 8.1
That's of course if you don't plan on going back to Windows 8.1
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