Just DL'd firefox to try. Turned off all AV and firewall like you said.
Firefox appears to have worked. Oddly though, when I uploaded the file, it never gave me the success page. Instead it brought up a "lost connection page". After trying to upload it a few times and having the same thing happen, I decided to try to connect to the browser via hardwire and after a few attempts it loaded the router page and let me log on.
Thank you so much! I'll let you know if there's any other problems.