|Is the wireless card integrated or did you use a pcmcia wireless card, or wireless usb stick?|
Check the Wireless connection in the network environment.
Sometime, suddenly it has changed from
Wireless Connection (2)
In this case Windows get in trouble and you may not be able to establish a connection to the wireless router.
Did you use the manufacturers driver or the Microsoft Wireless connection manager?
Under some circumstances, you must use the Microsoft Wireless Connection Manager to get it to work.
Please send a reply, if you solved the problem !!!