Nis 2012 full scan risks heuristic virus from compressed files ( mostly .msi )

Running NIS 2012 ( looks like 19.2.0.10 ) up to date.

 

I ran a full scan in normal mode and picked up a bunch of warnings ( see attached file ) about heuristic virus in compressed files ( mostly .msii ).  I exported the results and had NIS 2012 delete the files.

 

Ran full scan again ( normal mode ) and it said I was clearn.

 

Did some looking around and repeated full scan in safe mode ... it warned about 3 more .msi files ( which I also deleted ).

 

Any hints/ideas appreciated.

 

It seems like these are probably false positives of some kind?  So I should not worry too much right?

 

In a different thread or two some discussion of possibly a failed update might trigger this and/or should I think about re-installing clean?