Pls help...my wifi disconnected after a few seconds - k9ngm-l mobo

ok my rig is
msi k9ngm-l mobo
amd 64 x2 3800 proc
corsair ddr667 mem
i recently bought a wifi usb - dwl-g122
i connected it to my usb and install the cd then restarted
i got my preferred internet connection wirelessly but after a few seconds. i get disconnected.
I was thinking the new usb-wifi has factory defect so i tried to test it on my laptop, (of course i disabled the built-in wifi), i use the usb-wifi without a problem so im now suspecting the culprit is the mobo.
a quick history:
i was using lan before, i experience something like i can connect to my yahoo messenger but cant browse. i uninstalled the smbus( i just tried it , i dont know wat it does) in the device manager and reinstalled it with the cd that comes with my mobo. but it fix my browsing problem. now when i tried this. its still the same.
after restart i can connect for a few seconds then disconnected, i even cant browse other pc after disconnection but my status is connected.
i tried to ping sites and yes i can ping when im still connected.
please help...

hello any suggestion will do even if you tell me to junk my mobo and buy a new 1

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