I'm a bit perplexed.
Just updated Windows to 8.1
The previous installation of Avast seems to have disappeared so re-installed Avast.
Used to have the router address set as the home page on IE.
When I now open IE, I get the router log-on window then only part of the Router Status screen - just the headers, no details.
The same thing happens with Chrome & Firefox.
PC is connected to router by cable.
I've disabled Windows Firewalls, excluded router URL from Avast active protection and reset the router several times.
I've changed the Ethernet cable sockets around and rebooted the PC.
Internet is working OK, but I can't see any router information.

Don't know what else to do.
Any thoughts would be welcome.