On update loop constantly

We are assuming you are using Windows 10. You don’t state this. It also may help us to help you if you briefly describe how the problem happened. Were you installing an update, new driver, etc.

What have you tried so far?

This may help.

Accessing Advanced start-up when PC isn't loading:

If your device isn't loading or stuck during boot, you can use this method to access the recovery environment:

1. Turn on your PC.
2. As soon as the Windows logo appears on your screen, press the power button to turn off computer.
3. Repeat steps 1 and 2 two more times.

After the third interruption, Windows 10 will open into the Advanced Start-up environment

While in the Advanced startup environment, use the following steps to use Startup Repair:

1. Click the Troubleshoot button.
2. Click the Advanced options button.
3. Click the “Startup Repair” button.
4. Select your account.
5. Type your account password.
6. Click the Continue button.

If the above doesn’t help do the same as above but this time select “System Restore” from the “Advanced options”

Let us know how it goes.