the very first thing to do is to Image your hard drive. And save that in case you change your mind later.
This
thread should explain the down grade pretty much of course you'll have to find Win 7 drivers for your notebook!! Our G75 originally came with win 7 so its easier for us.
You might have better luck posting in the
G750 forums, this forum pretty much ended with the G75VX
You might want to try
ClassicShell and configure it to work just like windows 7, I'm very happy with Win 8.1.1 and ClassicShell almost everything is just like Windows 7 except faster
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro