So, somebody asked for my help in picking out the best possible PC upgrade I could find for them and I came to the end result of getting this https://www.newegg.com/Product/Product.aspx?Item=N82E16883227876 and then swapping the CPU to the i9 9th Gen 9900K and swapping the RAM for 64 GB of DDR4 RAM. The one request this guy had was to use Windows 7 since he hates Windows 10, so I plugged all of the parts into PCpartpicker and there were no incompatabilities listed for Windows 7. When I was loading his drivers onto a USB for when I switch back to Windows 7 for him, I found out the Z370 series MB's don't support Windows 7. Is there any way around this that anyone can think of? I've been thinking about it for hours and I have nothing besides using third party programs to make it look and work like Windows 7 while running Windows 10.