Recover drive storage space
Once you ’re up and running with Windows 10, and convinced you won’t need to go back to your previous version of Windows, it’s time to free up some drive space. Open File Explorer, go to This PC, right-click your ‘C’ drive, choose Properties, then click Disk Clean-up. As soon as the dialog opens, click ‘Clean up system files’, and wait for it to scan again. Go through the list, ticking those items you don’t need – the biggest item by far will be ‘Previous Windows installation(s)’. Tick this to free up space, but remember there’s no going back once the files are gone.