That usually isn’t enough to get rid of norton.

Uninstall avast and boot. You may also want to use the avast removal tool found here

http://avast.com/eng/avast-uninstall-utility.html

  1. download the removal tool from the link above (save it to your desktop, easy to find there :wink: )
  2. uninstall avast via add/eremove
  3. boot
    4)run the avast removal tool
  4. boot

Now for norton

  1. Remove NAV through Add/Remove programs from Control Panel.
  2. Boot.
  3. Use Symantec removal tool following the three steps defined in the Symnrt tool info. http://download.betanews.com/download/1125124391/Norton_Removal_tool.exe
  4. Boot.
  5. Install avast!

Post back your results.