|Double click on the entry for the Windows Update service.|
In the box marked "Startup type", make sure it is not set to Disabled.
If it is, use the down arrow on the right to set it to "Automatic (Delayed Start)".
Underneath there are two buttons. The one that is NOT grayed out is what it is doing.
If necessary hit the Start button. Finally Apply/OK your way out.
Best then to restart the computer and verify that the service is running.
[Just for info, any service that is set to an Automatic option will start with Windows, other options will not]
Always pop back and let us know the outcome - thanks