... or to follow up fo3nix - move your Laptop nearer the Router (after all the Laptop is supposed to be portable!)
Move the Laptop round your house and check for signal quality... if it is poor everywhere (esp when near the router then you've got a problem, either with the laptop or the router).
The position of the antenna on the router can make a big difference, so try it in different orientations.
A weak signal may need a bigger antenna - you can buy antenna extensions for some routers (e.g. Netgear)
Just a few ideas to try