look at the back side of the modem, there should me a small reset hole, use a pin or paper clip to press the reset button for about 20 seconds. The modem will reset and restart. now try and see if you get to the internet via your notebook.
 
in the windows, if you have selected any specific ip address to connect to the internet then select the option where it says something like "let windows automatically". do the same for the dns option.