Try installing drivers for Win 7.
That is what I had to do in order to get my video, sound, wi-fi, and printer functional again. The endearing part of the affair is that win10 install refused to have anything to do with these (already existing) drivers when it hammered in the update from win7 to 10. Makes you really love Microsoft, doesn't it?
Now busy, apparently for days to come, to remove or deactivate all the mess and unwanted 'features' foisted upon me by win10. It is very clear that either you give your soul and trust to Microsoft, or be damned. It is the Internet Explorer story over again. OneDrive, for example, is "integrated" so cannot be removed ?? What on Earth would I want to have Xbox games integrated in my OS? and so it goes. The GUI is horrible and even the ability of making the active title bar stand out in a different colour is now gone.