You can go to:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=4232351&lc=en&dlc=en&cc=us&dest_page=softwareCategory&tool=softwareCategory&query=cq42-227tu
select your operating system
go tot he category Driver - Network
You'll see a list of drivers, look for wireless. If you see several and you don't know whick one you have, You can try installing each of them. Usually, if it's not the correct driver, it would not install at all.
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