Can you also connect to other network with your laptop?
Can you connect with the router if you connect LAN cable between your laptop and router?
Maybe Firewall problems? Sometimes you need to configure your Firewall automatically, note that also router can or have Firewalls in build in.
Try open Network and Sharing Center,
Try Troubleshoot problems
Be sure to select valid Security type: "example WPA2-Personal"
Be sure you enter right Encryption type; "example AES"
Be sure to enter the right Network security key
Stil nothing works?
Try adding a network manually
In network and sharing center, on the left you can see manage wireless networks.
Select it and on the top you can see Add button. Select Add and then select Manually create a network profile.
Enter the network name, preferably the same as your routers name
security type, encryption type and security key
then select start this connection automatically.
select next and go into your computers firewall and add this network.
restart your computer and it should connect if nothing else is wrong.
Still not working?
Try disabling Internet Protocol Version 6 (TCP/IPv6)
Go into network and sharing center, manage wireless networks, and next to Add there is Adapter properties. Under Networking tab disable Internet Protocol Version 6 (TCP/IPv6). Restart your computer and try connecting again.
Also try resetting your WiFi.
Well I don't know any other solutions, good luck
I'm in Europe . The channels I could choose are 1-13. It was in auto and started choosing manually. When I put it in 1 it appeared. THANK YOU MAN! YOU SAVED MY LIFE. REALLY THANK YOU!!! – Giorgos Riskas – 2012-04-27T18:27:10.323
@GiorgosRiskas Glad I could help. I'm the kind of nerd that really wants to know what the real problem and the solution was, and whether my comments helped, so thanks for the follow-up. – Spiff – 2012-04-27T18:36:56.613