Atheros AR5007

[C4ri5]

I've a Compaq Presario F730US Notebook PC and I'm using the Compact Wireless-G USB Adapter #2 for my internet connection and my normal speed was about 11mpbs.
My roommate got the same laptop as mine except she has F750US version. And her laptop can connect to the internet without using any output devices and with the speed of 54mpbs from exactly the same place where I put my laptop at.
When I double check and notice that she has the network of Atheros AR5007 802.11b/g WiFi Adapter already installed in her laptop. Does anyone know how can I get that Atheros AR5007 installed to my laptop?