In start search box type services. In the list click on services (not the .exe if it shows). Scroll down to security centre and double click. Make sure automatic is selected and then start the service.
This thread is now locked and can not be replied to.
How to get Windows 10 for free | How to install Windows 10: There is still a way to avoid paying…
1995-2015: How technology has changed the world in 20 years
Alex Chinneck’s giant ice cube Christmas tree at Kings Cross