Windows reboots while updating
Most antivirus companies offer dedicated removal tools for their software, so be sure to download one for your antivirus.
Once you completely remove your antivirus, check if the problem is resolved.
If not, you need to enable disabled startup applications and services one by one or in groups until you find the way that is causing the problem.
Keep in mind that you need to restart your PC after enabling a group of services in order to apply changes.
To prevent your computer from further restarting, continuously press F8 before the Windows logo appears.
Press F8 until the boot menu shows up, and choose Safe Mode.
However, you can fix the MBR by doing the following: If your computer reboots after Windows 10 installation, the problem might be corrupted files on your hard drive.In few instances, users reported that their CPU was the cause, but before you replace any major hardware component, be sure to perform a detailed inspection of your hardware.Sometimes certain applications can interfere with Windows and cause it to restart.You can use the message or the error code you get from blue screen to search the internet and find the further solution.Sometimes your computer can keep restarting due to damaged MBR.