Solve PC issues: 2 important messages

Hi,  at the bottom right on my computer screen there is that flag with a red X and the message reads:  Solve PC issues:  2 important messages

I click on it and then it says:  Virus protection (Important) (I click on that too)

Next comes up a window with the question:  Do you want to run this app?  And I click on: Yes I trust the publisher and want to run this app

Then pops up a window of Norton Internet Security. In the lower half of that window it says: Your Virus and Spyware definitions are not up-to-date.

Your PC may be at risk of infection.

Next I click on 'Fix now" It then checks for updates, downloads updates and processes updates and all three are completed!

I click on  'ok'  and the next window says, with a red background  'Fix not complete'

I close that window and am back to square one! Can anybody here help?

Many thanks, gis