Asus WL-138G V2 wireless adpater on Windows 7: No internet access

Recently upgraded my old desktop computer to Windows 7. The pci wireless adapter Asus WL-138G v2, failed to gain internet access although it seemed to connect to the wireless network, the wireless connection icon comes with an exclamation, the hint shows "No internet access"
The following solution works for me:
Login to the wireless router, configure the wireless channel to: "Select the best quality channel automatically" or if your router does not have this option, you can try to change the channel to a different one.
After change of the channel, the computer connects to the wireless network successfully.

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