Running Windows 8.1 with four users and last Friday there was a windows update completed after which the keyboard would not respond either after the computer went to sleep or one user signed out and another tried to sign in. Restarting the computer would allow any user to log in and the keyboard would function fine until either sleep or log out took place. Used system restore and went back to Thursday and everything worked fine again. Fast forward to Monday and Windows updated once again the same symptoms are here. Any theories on which update is doing this or how I best resolve this issue. I had two keyboards I tried, one wired and one wireless (primary)
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