Network diagnostics asks for password for wireless network with no security

hi
I am trying to connect my Mac Pro to a wireless network which has no security settings. Other Macs in the house connect to the network with no problem, but the Mac Pro doesn't. I am setting up a new network as I have moved house. In the previous house the wireless worked fine on the Mac Pro.
When I click on the Airport Icon in the menu bar, the search wheel shows and it finds the network, but when I click on the name of the network typically it doesn't connect. Occasionally it does connect, and I briefly have internet access, but then the number of bars on the Airport Icon gradually reduce and then I can't connect again.
When I run Network Diagnostics from Safari, it finds the network also, but then typically asks for a WEP password for the Wireless Network when I haven't added any security to the network (occasionally it doesn't ask for a password and I can connect briefly)
I have tried resetting my Time Capsule and creating a new wireless network with a different name, but still experience the same issues.
I wonder if someone has any ideas as to what might be going on, and how I might be able to troubleshoot this.
Thanks
Nick

It is one of mine. Yes. It connects to it no problem, just doesn't connect to the actual internet. Network diagnostics has all green lights until the ISP and/or Internet point. If I walk through diagnostics, it will get to the point where it says that the network requires a WEP password. I don't know why it does that because my network is not password-protected (husband claims it doesn't work well with his VPN system to get into work network). If I leave it blank, the connection will work. Eventually, after the computer is put to sleep, I will have the same problem upon waking up. I just tried renaming the network and removing all preferred networks and rebooting. Let's see how that works.

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Network diagnostics asks for password for wireless network with no security

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