EGKK931, I have just installed the same netgear wireless router on my home system. I also use BT.
The router connects to the main pc with a network cable (not usb).
Can we assume that the laptop already has wireless! If not then you would need the usb wireless adapter for that, other wise it's not needed.
If so, once you connnect the router to your pc, then fire up the laptop and it should find the wireless signal.
It literally took 5 mins to get them up and running (maybe less)
You would then need to configure the wireless security of the router so that only you and your laptop use you internet connection and not the whole street where you live.