I've had this computer less than a week. It tried to do an update and keeps getting stuck at 12%. Researching online, I've found ways to put it into safe mode but none work. Please help.
I solved it by running a clean boot.
Disable all non-MS services and Start-up, don't restart it.
Press and hold the power key until the computer shuts off and turn it on again.
It should successfully install the update.
The reason why you should not restart it because it will try install the update before the restart, and it will fail.