After plugging in my external keyboard, both my external and laptop keyboard no longer function. The keyboards cannot type or execute shortcut commands. When clicking download links it results in downloading download.htm, pressing F results in opening the browser menu in chrome, and clicking website links results in downloading url.htm. This problem persists after unplugging the keyboard but only seems to begin after the external keyboard has been plugged in. After a restart computer use without plugging in the external keyboard results in no issues, though I haven't done so for extended periods of time. The external keyboard functions normally when plugged into another computer, though it was a Mac, so I'm not sure if the different operating system could have an effect here.
I've run a Malwarebytes scan already and it didn't pick up anything. I think it's likely a virus, but I can generally just use Malwarebytes to solve the vast majority of my problems so I don't know where to go from here. At the moment I'm running a Spybot search and destroy scan to see if that picks up anything Malwarebytes could have missed.
Any help would be appreciated, thank you.
Edit: Spybot managed to pick up and delete a virus called win32.downloader.gen, I also ran TDSSkiller and picked up no root kits. The problems still seems to occur.
Edit: I have used the computer without plugging in the external keyboard for several hours without issue.