Have you tried to disabled/enabled your Wireless connection. Click on Start => control panel => network and internet (or network and sharing) => network options => manage network connections, select your wireless network and right click on it, disable first then try to enable. Check your connections after.
Do you have a wireless Switch to turn on/off your wireless connection? Maybe a combination of Fn + F1 or F2 to enable your wireless connection?
Have you Power Cycled your devices in this order? http://www.labnol.org/tech/power-cyc...-router/13625/
Any Firewall or Security software installed?
Remove and reconnect your wireless network profile, make sure that you type in the correct security key. http://www.home-network-help.com/del...s-network.html