Recently, i upgraded my pc to Windows 10 using free upgrade from pre-installed 8.1.
Everything installed ok...until Windows 10 installed the wrong Amd graphic card for my pc via windows update.
Upon reboot my pc monitor screen went blank.I used Advanced Boot up options...pc could not Refresh nor Reset.
Upon advice from a friend i connected external hard drive which contained a copy of Windows 10 Iso image i made my pc desktop appeared an deleted all partions including recovery partion and re-installed Windows 8 again from dvd..installed relevant updates i needed and then installed 8.1 upgrade from Microsoft Store.
Phew....took a weekend to make my pc work.
This is the biggest problem with Windows 10 update procedure..it installs updates that you cannot stop especially Graphic Drivers.
Personally, Windows 10 updates routine should be the same as previous versions where you can choose or cancel a particular update or updates.
I had to purchase special HP Pavillion Recovery Media Discs which i need to use if pc crashes again since i don't have a recovery partion anymore.