I tried the restart recommended but I do not get past the reverting changes screen.

[Heyjude973]

Computer does not go back to desktop. Just cycles through trying to update and reversing changes.

[A4Apollo]

Hi! @Heyjude973, Welcome to HP forums.

I understand that you are unable to boot into your PC.  It Just cycles through updating and reverting changes.

Don't worry I'd like to help.

Did you make any software or hardware changes to your PC before this error message occurred?

Please provide product number and operating system of your PC for better assistance.

However, you can try few basic steps perform a hard reset on your PC.

Turn off the computer.
Remove the computer from any port replicator or docking station.
Disconnect all external connected peripheral devices such as USB storage devices, external displays, and printers.
Unplug the AC adapter from the computer.
Remove the battery from the battery compartment.
Press and hold down the Power button for about 15 seconds to drain any residual electrical charge from the capacitors that protect the memory.
Insert the battery and plug the AC adapter back into the notebook computer, but do not connect any of the peripheral devices.
Press the Power button to turn on the computer.
If a startup menu opens, use the arrow keys to select Start Windows Normally, and then press the Enter key.
After reconnecting each of the peripheral devices, run Windows Update and HP Support Assistant to update all device drivers.

If you are able to boot into your PC after hard reset try the steps mentioned below.

Type Windows key + R
Type in msconfig.exe and hit enter
Select the Services tab on the top
Check the box on the bottom that says Hide all Microsoft services
Click Disable all
Do an “Update and Restart” of the computer

I'll keep an eye out for your response.  

I hope you have a great day! 🙂