from that point, my machine started experiencing BSODs and soon, both my graphics adapters have stopped functioning. now the machine still functions but i cannot change the brightness from maximum, cannot boot into linux-based USB sticks, etc. i learnt a big lesson the hard way - to stick to the OEM's drivers no matter what.
PS. i am just sharing my experience so that others coming across this thread can benefit. i have no intention to revive back an old thread.
To change the screen brightness you need to install HP Hotkey Support. After doing do, you will be able to use the brightness function keys again.
https://ftp.hp.com/pub/softpaq/sp91501-92000/sp91903.exe
Being able to boot from USB is not affected by doing a clean install of Windows 10. You just may need to adjust some BIOS settings.
There is no need just to stick with the OEM drivers. To start with, when you upgrade from Windows 7 to 10, your system will not retain all of the Windows 7 drivers. A number of drivers will be replaced with Windows 10 specific drivers. If some drivers are causing BSODs, if you install
BlueScreenView, it should be able to show what drivers are causing the crashes and you can then update those drivers to prevent further BSODs.
In addition to that, it is better to do a clean install of Windows 10, rather than an upgrade, as a clean install will potentially work better. If you have software installed that you want to keep, then doing an upgrade makes sense, as it saves you the time and hassle of having to reinstall software. However, since you are starting with just the factory install of Windows 7, a clean install would be the better option.
I've done clean installs of Windows 10 on over 20 computers so far this year and have experienced no major problems. The manufacturers only provided Windows 10 drivers for two or three of systems. For the rest, the majority only had drivers provided by the manufacturer for Windows 7 and sometimes only for Vista. This is a good example as to why having Windows 10 support from the manufacturers matters very little.