Many people love windows 10, but Fred is not happy!
When Fred unwittingly accepted the upgrade from Win8.1 to Win10 he was not prepared for the 4 hours upgrade "experience", but once it was completed he was relatively happy until. . . .
'*Critical Error* Start Menu and Cortana aren't working. We'll try to fix it the next time you sign in.'
Fred restarted MANY times, but still the same message.
There are many solutions, google the message and you will see it has been an occasional issue for some even before the official release of Win10.
One fix that works "most" of the time is a true shutdown. This is not a normal shutdown, you need to crash out of Windows 10. Most of the time this can be achieved by holding the power button down for at least 15 seconds until all lights go off. When Windows starts it should repair itself and possibly check the hard disk. Of course if this does not work for you, contact us.
In the process of trying to assist Fred, I found one unsettling setting in Windows 10, system restore is turned off by default.
I strongly recommend going to the control panel (right click on start button and select control panel), click on system, click on system Protection, click on configure, turn system protection on and allocate at least 10% of your hard disk.
Fred has had enough however, so I have just finished resetting Fred's laptop back to the factory default of Windows 8.1, with a clean copy installed I have driven it straight through to a clean update of Windows 10.
It is difficult to please some people however. Fred has a shiny new install of Win10 and his laptop is faster than ever, but he still isn't happy just because he can not send email via outlook. Luckily for Fred it is a known issue affecting most versions of outlook after a win10 upgrade. It is necessary to run sfc /scannow from an elevated command prompt.
Trust micro to break their own software with an upgrade.
Now we simply wait and see if it remains stable.