"The trial period has expired !" Virus?

Well did you try a trial version of a program lately? If not, then it is spyware/adware trying to get you to purchase a full version of another program. Go to trend micro (see source) and run a full system scan just to be safe. If it found issues, you must remove then, either from a program or manually to stop the pop-ups. I would not Recommend Shaw Secure.