IE8 final version turns off NIS phishing protection

I saw on this list that IE8 Beta turned off NIS phishing protection. I just downloaded the released version of IE8 and it does it every time I launch IE8. I checked that all the Symantec Add-ins are enabled in IE8. I'm running NIS version 15.0.0.60 on WinXP. What's the fix please?

 

Thanks.