When you encounter this issue, you’ll receive the following full error message
The computer started using the Windows installation media
If you’re faced with this issue, you can try our recommended solutions below in no particular order and see if that helps to resolve the issue. Let’s take a look at the description of the process involved concerning each of the listed solutions.
1] Modify the Registry
Since this is a registry operation, it is recommended that you back up the registry or create a system restore point as necessary precautionary measures. Once done, you can proceed as follows:
Press Windows key + R to invoke the Run dialog.In the Run dialog box, type regedit and hit Enter to open Registry Editor.Navigate or jump to the registry key path below:
At the location, at the left navigation pane, under the Control key, scroll down until you get to the key named MiniNT.
Note: If you do not see this key, skip to the next solution.
Next, take Ownership of the MiniNT registry key.After you have taken Ownership of the key, right-click the key and select Delete.Restart computer.
On boot, try the Windows 10 upgrade again and see if the error The computer started using the Windows installation media is resolved. Otherwise, try the next solution.
2] Upgrade using Windows 10 ISO file
Since you’re encountering this Windows 10 upgrade install error using the Media Creation tool aka Windows Update Assistant, this solution requires you to directly download the Windows 10 ISO image file from the Microsoft website. Once you have downloaded the ISO to a location (preferably the desktop) on your device, double-click the ISO image to mount it as a virtual drive then double-click the setup.exe file to start the in-place upgrade process with the ISO file.
3] Clean install Windows 10
If none of the above solutions worked, back up your data, create a fresh installation media with the latest version of Windows 10 and then perform a clean install on your device. Hope this helps!
