Hi there and welcome to PCHF, i would like you to go into Internet Explorer and click on Tools, then Internet Options, on the Coonections Tab click LAN Settings, and make sure Automatically Detect Settings box is checked.
Next go into Firefox click on Tools then Options and click on Advanced and then the Network Tab. Then under the "Connections" box click on Settings. Make sure the "Direct Connection to the Internet is select, and ok your way out. Restart both browsers by closing and re opening them.
