on most laptops there is a "button" on the front or side and it turns on and off the wifi abilities on the laptop or a keyboard short cut.
do you have the instruction book that comes with the laptop?
check in there and it should tell what keyboard short cut or where the button is.
if that fails then i might be a driver
related issue but since its a new laptop that came with windows 7 then i guess not.
hope this helps.