Threat Detected window appears with no threats on Windows 8

So my Norton Internet Security detected a file that contained a virus the other day and I dealt with it but since then I get the Threat Detected window pop up randomly but there are no threats in the list.

 

As I can gather this is a rather common issue so if someone can instruct me on how to stop this from occuring then that would be hugely appreciated.

 

I am using Chrome on Windows 8.