Norton internet security 2011 will not start

2 days ago Norton PC checkup software lanched itself asking me to activiate it.

Since then NIS 2011 does not start.

I have unistall Noton PC checkup and rebooted the PC several times. But no effect.

I have tried to download the Norton Removal tools. But the ftp page comes back quickly with

 Internet Explorer cannot display the webpage

 

I have tried to unistall the progarm using the control panel option 'add / remove a program' The system cannot find the program and is unable to remove it.

 

I am now at a loss to know what to do next.

Can you help please...