Have had windows 10 for several months with no problems. Recently have not been able to log out or access programmes as windows icon in bottom left corner will not respond when I click on it. Have been turning computer off just using on/off switch which I know is not a good idea. Laptop is approx 3 years old. Any help appreciated. Mainly use Google chrome.
After following gangesboy's link, the scan came up with the result '...did not find any integrity problems' which is reassuring in one way but hasn't solved the problem! Am now shutting down using the Alt/F4 keys.