Unable to connect WiFi. Help !!

The problem is that in my other computer i cant connect to my home wireless network. I can see the connection when i refresh it, it has maximum signal strength but when i click connect it just keeps connecting until it says "Unable to connect" What could be the problem. It has Asus WL-138G V2 Wirless LAN PCI adapder. Adapter is working fine in two other computers so the problem must be the computer itself or what ? Please help me.

EDIT: I m letting Windows to manage wireless connection, not ASUS, cause the ASUS cant even find the connection.

Thanks in advance

 

I've had this problem before, and for me it's attributed to 2 facts:

The password for the network connection is wrong.
The network has been unable to establish an IP for that computer.

My solve to the problems were, simply checking the network connection, making sure all information entered is correct. Also using the integrated Windows Help system, to find what the error was, which I think is what your doing right now.

Idk if that helped, hope it did.

 

Hmm, well it cant be the password problem cause the connection has no password.

I tryed to connect with ASUS usb wireless adapter that i have in this computer and it connected without any problems. It's like router blocks it from connecting or something, cause i m able to find the connection but cant connect.