NAV 2010 conflict with outlook 2007 - getting symantec service framework error

Hello - I need some help.  I have NAV 2010 in stalled on my Dell D620.  I am running windows XP pro operating system w/SP3.  The problem is when ever I open Outlook 2007 - I get a pop up from NAV that says "Symantec services framework has encountered a problem and must close".  When I click OK to close the pop up - NAV shuts down.  It also stops outlook from sending/receiving e-mail.  If I open NAV and turn off email protection - all works fine.  I have unistalled NAV and reinstalled - still get the error.  I have unistalled outlook and reinstalled - still get the error. I uninstalled NAV 2010 and installed NAV 2009 -still get the error.  Everything has been working fine until last week.  Then I suddenly started getting this error.  I do not know what has changed.  I have not installed any new programs - only the Microsoft updates they push out.  Thanks for any help.