Windiows 10 "upgrade"

I loaded Windows 10 on my Asus laptop two nights ago. Now I can't use my computer. It erased or disabled my touch pad program which allowed me to use the TP the same as a touch screen. It also loaded a new replacement for internet explorer which reports all your browsing history to Microsoft. Invasion of privacy? How can I remove this abortion and go back to Win 8 which I also hate but at least I can work with it? I haven't used a mouse with this computer since I got it.

When you first install you have the option of going back to 8 if you want to. I think it was on the task bar but there is a time factor.
I lost the use of the built in microphone at first but there was a fix a few days later I found on Google. Check for updates and driver updates.
You can also go to privacy setting and disable the ones you don't want.