page load error

Hi, I'm experiencing connection problems when I use the internet.
majority of the pages that I try to enter shows this error:

Firefox

Connection Interrupted

The connection to the server was reset while the page was loading.

The network link was interrupted while negotiating a connection. Please try again.

IE

Internet Explorer cannot display the webpage

Most likely causes:
You are not connected to the Internet.
The website is encountering problems.
There might be a typing error in the address.


It happens for most of the sites.
Other than the pages that has error, the rest worked perfectly fine.

This happened a day ago, after a firefox update to 3.0.2.
IE version is 7.

Can anyone provide a solution? Thanks.

 

What is your internet connection? ADSL,GPRS,RAS DIAL?
If you ping sites like google.com or such do you get constant ping replies,
Have you recently installed any network monitoring software (there drivers sometimes do what your explaining) I would try upgrade by network card drivers or do a system restore and check if it is defiantly the firefox update - good luck