Use The Access Point That Came With HP Pavilion?

If my wireless router is on the first level of my home and my HP is on the second level, do I use this access point device to connect the HP to the internet or is the access point used to "extend" the wireless connection so other computers may connect to the wireless router. If its the ladder, how do I connect my HP Pavilion, that is on the second floor, to the internet? I have another HP Pavilion Slimline on the first floor that connects to the wireless router with ease.[CODE]