Unable to connect to wireless network

Hi guys and gals,

A weird problem for you. Any ideas are more than welcome!

I have 2 wireless networks - SSID1 and SSID2.

I can connect to SSID1 without any problem at all, thus proving the Windows 7 based laptop and network card work.

I cannot connect to SSID2 on this laptop. However, other devices can without issue, thus proving the router is working.

I hear you shouting check the SSID is entered correctly - it is.
Now you are saying "Check your password and do you know it is case sensitive" - I know its correct in every way - I set up the other devices and the router password.
"Ah," you say, "Then how about the encryption type?" - Yes both router and the laptop are set to WPA2 Personal (as are the other devices).
"Only one thing left - the authentication method" - sadly no - all are set to TKIP

I have deleted the network connection, I have then tried to set up the connection by letting Windows 7 find the details with the Connect To A Network "link" and by setting it up manually.

A wired connection to the router works without problems.

The connection fails with a message:

Windows cannot connect to "SSID2"
Wireless association failed due to an unknown reason.

Does anyone have any ideas?

Thank you.

I really appreciate thank you messages as a payment for solving issues :o)