Hi Prince Midas
I have a Belkin Wireless set up. I have a desktop PC and my wife has a laptop. The Router is sitting on the top of my desktop computer and the PC transmitter/receiver is on top of the monitor 3 feet away.
When my wife uses her laptop, she uses it in the lounge, which is some 30 feet away. We don't have any signal problems. However, a thought comes to mind, although there are two walls between the router and the laptop, they are only 'Stud Walls' (plaster Board or Plywood)
I do know that you can have problems, if the signal is passing through walls made of something dense like concrete or brick. Could this be your problem?