Hi Karl,

When upgrading to Windows 10 from Windows 8.1 or Windows 7, you may face BSOD. Normally, this would happen due to BIOS settings. In some cases, the error could be due to corrupted download of the installer.

There are two scenarios when booting Windows 10. In the first scenario, you can access the desktop while in the second, the Blue Screen of Death won’t even let you reach the desktop and you are stuck in a loop of computer restarts.
The main reasons why BSOD appears are:

1. Some Windows driver causing conflict or
2. Some Windows Update gone wrong. If the latter is the reason, you have to remove and block the update that caused Blue Screen of Update.

If you can access the desktop, go to Settings and then Windows Updates. Click on Advanced and then on View Installed Updates. See the date of the updates and remove the ones installed on the date after which, the BSOD is appearing. If removing the updates fixes the problem, block the update from reinstalling itself.

If the problem is a driver update, you need to see if any drivers were installed lately. The process is same as above. You will see driver updates in Installed Updates. But after removing the update, I suggest you block automatic driver updates from Microsoft. Using a third party tool that allows you to select the driver version is better. That way you will be playing it safer.

BSOD reboot loop prevents access to Desktop
If you are stuck in a Blue Screen of Death reboot loop, Windows 10 will automatically go into the Repair mode after a while. From there, use the System Restore facility to fix the issue. Click on System Restore and select a date/point before you started getting BSOD. System Restore will restore your computer to a prior time, removing any changes made to your computer by Windows Update. It will not affect your files.

You roll back changes using a restore point to get up and running again.

1. Open Start.
2. Search for Create a restore point, and click the result System Properties.
3. Click the System Restore button.
4. Click Next.
   
5. Select the most recent known working restore point that will help you to fix the current problem.
6. Click the Scan for affected programs button to see the applications that will be removed if they're installed after the restore point was created.
7. Click Close.
8. Click Next.
   
9. Click Finish.
   

Once you've completed the steps, your device will go back in time to a previous state where everything was working correctly.

I hope this helps.

Regards,
Lokesh