While your laptop may have built in wireless, I don't know of any that have bluetooth built in. You would need a bluetooth dongle which plugs in to a usb port, W7 should detect it automatically for use with your device.
There are many models that have bluetooth built in... my laptop is one of them. If the switch is turned on, then ensure you have drivers / software installed. If you look at the bottom of your laptop, it should have a sticker telling you what wireless devices are installed. (FCC requirement).