Need Help with Safeweb and Norton Toolbar for NIS 5 for Mac and Safari

I have been a windows user for over 25 years and just switched my home PC to a Mac.  For most of those 25 years, I have always been a very loyal customer of Norton/Symantec Antivirus and Firewall products.  Because of this, I purchased NIS 5 for Mac even though I was told by Mac users it was not necessary.  Regardless, I purchased it anyway and installed it.  Although the box states that the Safeweb and Toolbar are available for Mac OS 10.7 and Safari 5.0 (which I have since my computer is brand new), my Safe Web and Norton Toolbar do not appear to be working (even though I have it turned on).  These always worked perfectly for me in the Windows environment and this is one of the main reasons I purchased this product for the Mac.  Am I doing something wrong?  Any help would be greatly appreciated.  Because of these issues, I am not feeling as secure as I have in the past with Norton products.