The signal strength is weak or signal quality is low.
Assuming there's an access point close to your computer, a weak signal is probably caused by some kind of obstruction between your network adapter and the access point. To improve the signal quality and signal strength, try moving the adapter (and the computer if the adapter is on a PC Card) to a different location. The wavelength of radio signals at 2.4 GHz is extremely short (they're called microwaves for a reason!), so moving the adapter even a short distance can be enough to make a noticeable difference.
If you're using a USB adapter, you can be more flexible about its location. Try placing the adapter on top of a bookcase or in some other location with a clean shot to the access point. ...
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