Click Start then click Run. Type in "cmd" and a black box will appear.
Type in ipconfig/all and press enter. Scroll up until you find a line starting with "default gateway" write down the number that's on the same line and type in "http://(number)".
You'll find the webpage this way.
Click on your Start button and select "Run...". There, type "cmd" into the field and hit ok.
Then type "ipconfig" into the black window that opened and hit enter.
this will give you some infos, one of it being your Default Gateway.
Take note of this address: something like 192.168.0.1 or the likes and enter this exact number into the internet browser on your pc.
You should now connect to the web browser of your router.