I have had 2 problems with build 14291.

One of the 2 has been resolved ........ sfc /scannow not working is fixed. Thanks to member Waltc.

Last problem yet to be fixed ........................ Safe Mode.
I can go to safe mode , but unable to use it at all because the screen is repeatedly refreshing making it impossible to do anything.
Not a big deal to me as I don't even remember when was the last time I needed to go to safe mode.
But knowing a solution is always welcome.