NIS 2009 - driver compatibility issue

I have Windows 7RC - Build 7100.  I have been testing the beta versions of NIS 2010.  The latest version was very stable, with one minor issue I was able to resolve.  With only 3 days left on the latest beta, and with one of today's threads indicating the latest 2009 version now works with WIndows 7 - I decided to go ahead and reinstall NIS 2009 (downloading it from the website).

 

The version I downloaded and installed is version 16.5.0.135.  It appears to work fine except everytime I boot up I get the following message:  "Driver blocked due to incompatibility.......".  Does this mean NIS 2009 isn't really working fine with WIndows 7RC?  If it is working fine, why am I getting the message and how can I fix it?