Windows 10: I downgraded windows 10 to windows 8.1, now I can't connect to the internet.

There is multiple problems after I downgraded my Lenovo Ideapad 100S-iby to windows 8.1 pro n1. Keyboard and trackpad don't work, have to use usb mouse and keyboard.2. Can't connect to wifi, can't install wifi adapters, even tried ipconfig /all.3. display adapters don't appear on device manager, and my display driver doesn't show up when I try legacy hardware.Can I fix these? If yes, how?

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Unlocked Realtek HD Audio Drivers Windows 7 & 8 (With Dolby Digital Live and DTS Interactive)

DTS supported natively by Windows 8/8.1 and it should work on windows 10 too just DDL require to unlock your driver .

 

Upgrading to Windows 10 from windows 7 and losing internet connection

Did you run the Windows 10 connection troubleshooter?

Troubleshoot Internet connection problems

Also, check in the "Device Manager" to see if the network adapter is ok.
You may need to un-install it and then "Scan for new devices".

This is published by HP; however, it gives some good info on troubleshooting with the device manager.
HP PCs - Device Manager Information (Windows 10, 8)

 

Upgrading to Windows 10 from windows 7 and losing internet connection

A couple of days ago I upgraded my desktop to windows 10 after getting one of those MS prompts. However now I cannot access the internet and suspect the drivers from the Gigabyte GA-MA790X-ud4 motherboard does not support the internet drivers required. Searching the manufacturers website has not given me any joy either. Can anyone offer any suggestions?