THIS WORKED FOR ME:
Problem I faced
# Everything was fine untill one day I uninstalled Norton Antivirus
on my compaq laptop with Vista OS.
# IE, Firefox
, Chrome -> none of these could connect to internet (Page not found error) after uninstalling Norton.
# Tried all possible things with Tools > Internet Options ... nothing helped
# Deleted the remaining files from Norton installation folder, norton entries in the Registry... nothing helped.
Wish I could get back to a state I was before uninstalling this Norton Antivirus.
This thought made me look for tools that can help me restore my system to the old nice state.
System Restore tool of windows !
Best thing about this System Restore
Restores the system back to the date we choose.. but does not affect the photos, documents that we have stored :) [as far as I read about the tool and I saw on my system... I may be wrong though.... please do not hold me responsible, if u run System Restore and loose data or face any other problems].
I suggest u read about the tool and decide if u want to run it or not. I'm just saying what worked for me.
How to run System Restore
Start > All Programs > Accessories > System Tools > System Restore > Choose a different Restore Point > Next
Now, choose a suitable data .. in my case, I chose a date that was before I had uninstalled the Notrol suite.
The system will run restore and reboot the system (may take several minutes).
When the system restarted I was able to access all my favourite websites from all browsers. :)
Hope this helps !