If you have an old receiver card it can make a huge difference. My old laptop could barely catch a signal. My new laptop seems to pick up a signal anywhere.
Also you can look up tutorials on how to optimize your router such as turning off unused protocols. You can get a signal booster and/or a better router. The new ones are much stronger than anything that is a couple years old. You have to read the reviews though and figure out which is best.
Also check to see if there are any major thick walls blocking the signal. I can't remember which computer mag it was but they had a really good tutorial for getting good signals through all kinds of tough spots.
You can also look up your specific router / wireless card and see if other people have similar problems. That will give you a good idea if it is your equipment or if it is a point a to point b problem.
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