I had firefox 15.0.1 on my computer, I tried to update, and could not. So, I uninstalled the older version, thinking that there was some sort of conflict between the old and newer versions. So, when I try to install Firefox 16.0.1, I get an administrator pop up box saying I need rights to continue. The word administrator is in the user name box, and the password box is empty. I have never entered/ or used an administrator password, and cannot figure out why this box keeps coming up. My system is a PC using Windows 7 32 bit. Appreciate any help you can give. Thanks, CraigL