Somehow you may just have got the double-click time set to the fastes possible - it's almost impossible to use then. Go to the Control Panel - Mouse - and make sure the double-click speed box is in the middle of the speed range.
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