[help] MN-520 not working for MSN Audio

Hi there,

I bought a MN-520 Wireless-B adaptor. It works without any
problems until I tried to talk with a friend using MSN
Messager Audio. I can hear him but he cannot hear me.

My Mic is good. As long as I switch my MN-520 to a wired
10/100 Ethernet adaptor to connect to my Netgear MR814
wireless router, everything is OK.

I cannot see any hardware conflict between my wireless
adaptor and the sound card. Whenever I try to talk on Mic
in MSN Messenger, the "wireless" light on my MN-520 will
be off. The manual never mentioned a situation that
the "power" light is green but the "wireless" light is off.

Many thanks in advance for any helps.

-- Yan