Dad's aging Core 2 Quad machine apparently does not like ancient nVidia graphics cards. Now uses an AMD Radeon HD 7770 GHz Edition just to render the desktop and other certain effects better than the onboard graphics does.

Surprisingly, Windows 10 runs pretty well on that machine. Even if Windows 11 didn't restrict hardware requirements, I most definitely wouldn't install it on that system. I already almost didn't install Windows 10 on it; the machine had a Core 2 Quad Q6600. Since the changes - upgrade to fixed Q9550 and 128GB SSD -> 250GB HDD -> 256GB SSD, I finally upgraded it to Windows 10. But...

This required a long EOL version of Windows 10. Basically: Windows 7 -> Windows 10 1607, Windows 10 22H2. I backed up the Windows 7 install before doing this so I had an ass-covering. It worked, though.