That Windows Update stuff is killer. I've just been through a 3 month nightmare with Bluetooth drivers on an 8.1 laptop, which just last night was when I figured-out it was the bluetooth causing my NIC issues. I can only imagine what the video sub-system issue must be like... Also, right-click on your SH4.exe file, left-click on "Properties", and on the "Compatibility" tab, tick that "Disable display scaling on high DPI settings", and see if that helps. There's also the v-sync setting in the game itself to try. A big thing for both of my SH4 computers is to match the display monitor's "Native Resolution", which on this is 1280x1024. So Windows is set to that, and so is the game. I'm not sure about matching some of the higher resolutions, if SH4 can even do some of those. I'd be lost with "modern" equipment...
