The HP/Compaq website doesn't know about any device called wa1000 and neither does their on-line search wizard. Also, when asking for network adapter drivers, you should always state whether it's a wired or wireless device.
If your referring to a network card, you will need to select the pc model it came installed in, in order to find a driver. HP/Compaq doesn't post drivers according to the device name, they post them according to what pc model they came installed in.
Start here (and type in your pc model number): http://h10025.www1.hp.com/ewfrf/wc/s...en&lc=en&cc=us