Wireless controller not working on Compaq CQ61

I have installed Windows XP Pro on a Compaq Presario CQ61, downgraded to XP as I am told this machine was built for Vista. I have managed to download and installed all drivers successfully except the network controller which I am unable to find since the laptop did not come with drivers. I prefer to stick with XP and not have to move to Vista. Please advise on where I can get the correct network controller that will work with XP on the CQ61-415EI and whether this will resolve the wireless problem. In my device manager, there is only item which is in yellow with a question mark showing and says the driver for network controller is not installed. The device is enable but no driver installed. My bluetooth is on, but the wireless is disabled. Please help me, I need to use wireless on this laptop to access home wireless internet.