|The 1394 connection you can see in Device Manager is a different device altogether and has nothing to do with the USB WLAN adapter you bought.|
1394 is also called "Firewire", it has an oblong port similar to usb but it's for connecting things like a video-camera for transferring video to the PC and then to a DVD.
If no other device is listed under under Network Adapters other than 1394, the WLAN adapter you bought is either faulty or the drivers haven't been installed properly.
With this type of device, you must not plug it in for the first time until you have started to install the driver software, then wait until you see a prompt to plug it in.
If you plugged in the device before installing the driver software, that is probably why you are having problems with it.
If you are sure you everything properly and in the right order, take it back for a replacement.