Laptop keyboard mouse:right click and left click functions reversal

[ktp]

Hi,
I am after some help. My laptop has decided to reverse the right click and left click functions, ie: if I left click it now does not select but instead brings up a menu (which the right click button should and used to do!) I've tried holding down both buttons (as suggested by a friend) by this has no effect and I can't see any options to reverse the functions in the 'mouse properties' menu... and ideas please!
Thanks
ktp

 

[Roderunner]

Hi ktp, welcome to Seven forums.