Basically, it doesn't mean a lot...........it is your system summary.

If your AV finds anything then it will warn you with a virus found message. You might like to boot into safe mode and run a complete system scan I normally check for AV updates every day, or the next time I use a particular machine (I have quite a few). I do a full scan once a week after updating..........it is a good habit to get into.

I also periodically run Housecall, that is Trend Micro's online scanner.

Hope that helps