|This seems to be an older post, however you might find information here if you haven't solved the issue already?|
1. double check that your update was full and complete and from a known good source. adobe acrobat
2. ensure that the keyboard is clean, and you may wish to reconsider a re-install/update of the driver. if there is a second keyboard available, can you try it to see if it a hardware issue.
(This ensures that its not a keyboard issue, that happened in parallel)
The second thing that I would check is to run a full scan with a reliable anti-malware. If you don't have one I would suggest malwarebytes free edition.
best of luck.