NAV2010 keeps finding AngryIPScanner

I have two installs of NAV2010 (WinXPPro/SP3 and WinVistaBusiness/SP2) with the same problem:  They keep finding AngryIPScanner (a tool I use in my work), even though it's in the Exclusions list, and they keep asking me what to do with it.  How do I get it to ignore AngryIPScanner altogether?

 

TIA!