Win 7 cant connect to wireless router Linksys WRT160Nv2

[Astoria]

This week I upgraded my desktop from Vista to 7.
My wireless always worked flawless with Vista, but 7 is giving me problems.

It sees the various networks in the neighborhood, and when I select mine, I need to enter my passphrase.
When I enter it it says that its not correct.

On my Vista laptop I enter the same passphrase, and it works fine. Same as with my desktop when I had Vista on it.

Does anyone know what this can be??? Help will be very much appreciated 

[Quantos]

Do you have a key for the encryption that you need to enter?

[Astoria]

Do you have a key for the encryption that you need to enter?

Is what you mean the same as the passphrase?

[Quantos]

Yes, by key I mean passphrase.

[Astoria]

Yes I do have the passphrase. It's my router, and I use the same passphrase for my Vista laptop.

[patio]

Perhaps you forgot to setup the passphrase on the Desktop machine...
It's not going to automatically see it just because it's on the laptop...
This is by design.

[Astoria]

Uhmmm no I didnt forget to set it up.

When I select my wireless network on the desktop, it asks me for the passphrase.
I than enter the passphrase (the one I created when I set up the router) and than I get a message saying that the passphrase is incorrect. However, when I connect to my network with the Vista laptop, I enter the exact same passphrase, and it connects.

Remember, it connected fine to the wireless when I had Vista on the desktop. It changed after I upgraded to Windows 7.

[patio]

Ummmm since you changed OS's it needs to be setup again ...from the beginning.

[Astoria]

What needs to be set up again? The router or the desktop?

[patio]

Your connection...