[Fixed] Cannot delete Windows 10 temporary files

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We have many HP Stream devices and these have only 32 GB of storage. Windows 10 is a compact operating system and this is enough, particularly if you are mainly using them with cloud services. However there is a known bug in Windows 10 where sometimes Disk Clean-up (from disk properties or Settings > Storage) sometimes fails to remove temporary files. By using WinDirStat I found that I had over 4GB of un-deleted Windows updates. To do a brute force delete* of all temporary files open a command prompt as Administrator and,

rem delete temporary files
del c:\temp\*.*
del %temp%\*.*
del C:\Windows\Prefetch\*.*

rem Stop and restart the Windows update service
Net stop wuauserv
cd %systemroot%
Ren SoftwareDistribution SoftwareDistribution.old
Net start wuauserv
del c:\softwaredistribution.old

* at your own risk, feel free to make a backup first.

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