Facebook does not work with Vista

Hello,

I have problems trying to access to Facebook (on Windows Vista v6.0).

Facebook says that my web browser is not supported, but I tried with 3 diferent web browsers:

Internet Explorer 7 (not supported)
Opera 9.63 (not supported)
Firefox 3.08 (not supported)
Safari (supported)

An still the same message, but I can access Facebook using Safari 4.

It is not a user agent problem because I have installed The Firefox's User Agent Switcher add-on and it's the same, I can't access to Facebook.

I use Zone Alarm firewall, but is not the problem because I have disabled it and still the problem.

I guess the problem is with Windows Vista because in Debian everything works great.

Any ideas what is wrong with MS Vista?