Clean up after a Windows 10 upgrade and regain loads of disk space

Whenever you install an update on a PC running Windows, especially if it is a service pack, larger update or even upgrade to a new version of the operating system, you end up with leftovers that remain on the system.

They are there so that you can return the system to the old state. That is useful in the beginning as updates can be the cause of issues on the system.

We have seen quite a few security update releases in the past for instance which produced blue screens, reboots or other undesirable effects.

Those leftover files become dead weight soon thereafter though. If you have installed the updated and noticed no issues fora couple of days, weeks or even months, then you may want to consider removing them.

This is especially true on systems that don't have a lot of free disk space. Depending on the updates, you may be able to free up Gigabytes of storage on the system.
If you have upgraded a Windows PC to Windows 10, and it does not matter if you did so using the preview or will do so once the operating system gets released officially, you will be able to remove old Windows installation files from the system to free up space.

Browse the root of your system drive, and you'll probably find two sizable directories (These folders are hidden by default, to see them you will need to enable viewing of Hidden files and folders) -- $Windows.~BT, and $Windows.~WS, as well as a Windows.old directory created during the upgrade. These files can now be safely cleaned up from your Disk after you have successfully completed the Upgrade, you could free up Gigabytes of disk space from your Hard Disk Drive.

While you can just delete large folders, the best way to regain space after Windows 10 Upgrade is by using the built in Windows Disk Cleanup tool in this video we show you how to do this.