Reverting changes." When you see these type of messages, it can be a somewhat hard to figure out what went wrong because these are generic errors that may appear at any time during the installation of an update.
After modifying the registry, close and go back to the Control Panel, go to Windows Update and check for new updates.
Now, you should be able to see and click the Get Started button to upgrade to Windows 10.
For example, on day one the company rolled a huge update to resolve many problems around the new operating system.
Only a week later the company released another servicing update focus on fixing various issues in the operating system, an update that many people have referred as Service Release 1 (SR1), but it's simply a non-security cumulative update.
Warning: Make sure you understand that modifying the registry in Windows can be dangerous.
It's assumed that you know what you're doing, and you have created a full backup of your computer prior using the following instructions.
This method documented by Microsoft should work Windows 7 and Windows 8.1.
However, it's important to mention that Windows 8.1 users must also use Control Panel, and not the modern PC settings to complete the process.
According to Microsoft, error 0x800F0922 happens when there is not enough free space on the System Reserved partition.