Wireless network to share printers

Wireless Internet router company, one of the desktop to connect a printer, my IBM ThinkPad R52 can access, but can not find on-line neighbors, and not to share the printer, how do? Urgent.
In addition, wireless Internet access away from any requirements of my office in the House, 17, I live across the floor, 5, the distance between the floor of the two is not more than 40 meters, my laptop could not find the network, but other people can find notebooks, and the normal Internet is a different matter how ah? My laptop in the company's Internet access business as usual.

Find it with cable.Khan.
Where is the Microsoft patch.
Network protocol was updated!