Hi:
There was only one model wlan card that came with the dc7700.
This is the driver for it. See if the Vista driver works on W7.
http://h20565.www2.hp.com/hpsc/swd/public/detail?swItemId=vc_58030_1#tab2
If that driver doesn't work, please post the hardware ID for the wireless card needing the driver.
To find the hardware ID, there should be a device labeled in the device manager called a Network Controller.
Click on that, and then click on the Details tab at the top of the Network Controller window.
Now you will see a Property drop down list and it will be set to Device Description.
Drop down on that list and select the 2nd item (Hardware ID's).
Post the top string of characters that you see in the window.