Occasionally you may have problems where the Adelbert programs in control panel does not properly or totally remove Norton anti-virus elements. Depending on the exact version of your operating system and the products you have go to the site to find the appropriate removal instructions
http://service1.symantec.com/SUPPORT/sharedtech.nsf/docid/2005092709200113?Open&src=symsug_us
To download the Norton AntiVirus removal tool click on this link
ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe