Getting error when browsing websites, causes other errors

Hello everybody.
I'm a newbie here and joined because I'm in urgent need of help!
For the last 4 days or so I've been facing this error message:
Program has encountered a problem and needs to close. We are sorry for the inconvenience.
It appears with a blue 'I' in a circle, and it shows messages EVERY TIME when I browse websites. When I click the "Don't Send" button, it doesn't close the webpage. Worse, it adds another error message from Norton's Antivirus 2006, saying:
Norton AntiVirus 2006 was unable to start the Instant Messenger scanner. It will be unable to scan Instant Messenger downloads for infections.
This comes out randomly as the other error messages. I wish to post the screen dumps of those error messages but I'm unable to upload because I don’t have a server.
I urgently want this problem to fix. That’s why I need help and it will be appreciated.
Thanks.

