I've just set up my new computer OS = XP pro - installed .net, iis, websites etc.

when trying to view http://localhost/.... with firefox I'm prompted for username and password with popup dialog "authentication required".

Internet explorer 7 is not doing this.

It's the same dialog that iis displays when you disable anonymous access, but this doesn't make any since IE works. I disabled windows firewall etc with no joy.

It appears IE has been granted rights to IIS/virtual directory but firefox has not?!@#$%^&*

Anyone have an idea what is causing this?