No Norton Toolbar In Google Chrome

I am running Windows XP Home SP3 fully updated with Windows Update and NIS 2012 Version 19.9.0.9

 

I have just installed Google Chrome (23.0.1271.64) and to my surprise there is no Norton Toolbar

 

If I click on [Customise and control Google Chrome]  [Tools]  [Extensions],  I get the message "Oh dear ... You have no extensions :-( "

 

Is there a way I can add the Norton Toolbar extension to Google Chrome