"...........Not too sure if I should especiallt as I have already updated the flash player....."
You're right to be cautious as the page in your click here is from a rogue site masquerading as the Adobe one with the intention of tricking you into installing malware.
As you're seeing this message frequently it would be a good idea to scan your PC with the free version of Malwarebytes' Anti-Malware - you can get it from here. It's usually a very effective tool for removing pests. Note that at the end of the installation you should untick the option to start the free trial of the Premium (paid-for) version.