Windows does not connect to Airport Express with WPA-Enterprise

Hey,
we are using some AirPort-Express stations at our office to provide a wireless network to our staff.
The APs use WPA/WPA2-Enterprise (linked to a RADIUS-Server) to check the users authority.
On Macs and iOS devices the connection to AP works fine but if we try to connect a Windows client, Windows shows up the login-screen, checks the password (if you try a wrong password it shows the login-screen again) but then it says that no connection is possible. We also tried it on another laptop (both using Windows 7 Professional), but it still does not work.
Can anybody help us?
Thanks!

This issue is often caused by Windows firewall, and sometimes caused by wireless interfernece. Try disabling the firewall or other anti-virus software. You can also directly connect you AE to your computer via ethernet to access the configuration.
If all else fails, you have hard reset the AE device and reconfigure.

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Tesserax,
What is the make/model of the Comcast-provided modem? How about the Vonage router? Is this router also wireless? Finally, I assume that prior to introducing the AirPort Express Base Station (AX), the modem & Vonage router were working properly ... correct?
Thanks for your interest in helping me. To answer your questions:
1. The comcast make and model for the cable modem is Scientific American Model#DPX2203
2. The vonage router is ethernet hard wired connected between the cable modem and the apple express wireless route. The vonage router is model#VDV21-VD
3. With the exception of the wireless connection between the Xbox 360 and AX; everything works fine.
4. The AX is running Apple firm ware 6.3
In the discussion I have read of similar problems and have tried them all to no avail. I'm sure the is a fix to this problem because of people in the discussion groups have had the same issues. I don't suspect the wireless router because it has a steady red light and only turns off when we do the network test or scan for networks.
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Hello CarreraHenk. Welcome to the Apple Discussions!
When I open the airport icon on the top of the screen then I see the network. If I select it and try to connect I have to enter a password. After a few seconds I get a message that "There was an error joining the selected Airport network".
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Windows does not connect to Airport Express with WPA-Enterprise

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