Scream,

You haven't given us much information about your computer or the version of Norton that you had installed, but the manual uninstall instructions from the Norton links below should help you get it cleaned off the system:

How to uninstall Norton AntiVirus 2000/2001/2002/2003 (Use the RNAV2000.exe removal tool to clean things off.)
http://service1.symantec.com/SUPPORT/nav.nsf/docid/2001061911223206

How to completely remove Norton AntiVirus 2004 and then reinstall the program
http://service1.symantec.com/SUPPORT/nav.nsf/d4578f66d8f00a0188256d4e006aaa94/9f87b423fda7cebe88256d97007bcdd0?OpenDocument&prod=&ver=&src=sg&pcode=&svy=&csm=no

Here's the registry keys that our setup checks for. Make sure they're gone.:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Norton AntiVirus
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Norton AntiVirus Corporate Edition
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Norton AntiVirus Corporate Edition for Windows 7.0
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Norton Rescue

Hope this helps.

Grif