Hi Grannie. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.
What exactly happens if you tap the letter twice on the keyboard? Is this what is not working? If not please explain a bit more so I can guide you with repairs.
When I'm typing in Word (or wherever) and I come to a word that contains the same leter, number, space, or character twice in a row (se leter a few words back), it types only one. This is the second time this has hapened; the last time the system gave me
some instructions that adjusted the amount of time aloted for a leter to post. It worked for a while, but as you can se, not any more.
I would be most appreciative if you could help me with this. Thank you.