How to capture wireless?WiFI

["Roader" <20080110 () 163 com>]

Hi,
    My name is ErWei Zhang.I'm a wirshark user in China.I want to capture WIFI data.How to capture them?How to set 
wireshark?
    I used one tp-Link wireless adapter(wl-310).The operation system is Widows XP.CPU is Intel Pentium 1400M HZ.Memory 
is 496MB.
    Yesterday,I used wireshark capture some wifi data. But I think it didn't capture all I want.It contain some ARP 
data,not have IEEE 802.11data. Why?
    The picture in the mail is a example i capture yesterday.
    Give me an answer,please.How to set wireshark? How to capture i want?
    Thanks!

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