Get a linux bootable usb and test the keyboard that way. Eliminates windows being the problem.
https://ubuntu.com/tutorials/create-...ows#1-overview
ETA also try a usb keyboard and see if the issue persists.

 

Already did the USB keyboard and it doesn't seem to do it there. I'm not sure what that tells me at this point, though, since I just replaced the laptop keyboard and it's still doing what it did before. I can't possibly have gotten a brand new keyboard with the exact same bad keys.

 

He means to make a bootable thumb drive to test the keyboard.

You can also boot to windows recovery media, then go to a command prompt to check.

 

Those sorts of tests aren't very helpful because it seems to not really do it after a restart and it seems to degrade over time. It seems to need a day, althhougghh today it''s not takingg as longg. I suppose I''ll try it but I''m still not sure whhat I''ll learn from it. I mean if it doesn''t do it on thhe bootable drive, thhen whhat?

 

Wait... did you already reload windows?

 

Not yet. I updated eeveryytthing under tthe sun, messed with BIOS and regedit, found that it doesn't do it on an external keyboard, replaced the keyboard, and none of that helped (except I got back capital G and H).

 

On a Surface, I've had to uninstall the built in keyboard, reboot, and then Windows will reinstall it. Also had to do the same thing for the sound card on the same Surface.

 

I did that with the drivers. Do you mean physically start it up with the keyboard disconnected?

 

No, uninstall from the device manager. sounds like you did that though.

 

I did, yes.