Firefox can open, but cannot browse anywhere

[mystvearn]

My friend has installed firefox on a toshiba protege with vista business. She has downloaded firefox, can install it, can open it, but cannot browse any website on firefox. The windows firewall is turned off. I am not at the computer, so I cannot say anything else. I myself have no experience on vista, and have no idea what seems to be the problem. Does anyone know how to solve this problem?

[doctorgonzo]

Can she browse using Internet Explorer? What error message does she get when she tries to go to a website in Firefox?

[rapidarp]

Have you checked the support forums on Firefox's website?

[not important]

I would guess there is a pre-installed Firewall or AV software stopping FF.