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go to the device manager.
right click the My Computer Icon -> click on Properties
click on the Hardware tab -> Device Manager button
you can see all the drivers installed in your laptop. if you want to reinstall the driver, just double click the hardware you choose -> click on Driver tab -> click on the Update Driver button. select the path where you put the driver for your hardware. then click on Ok till you get to the desktop. then your done. test it.
no you cannot replace the built-in wi-fi card...
if you try to change the drivers for atheros wi-fi to Broadcam driver, your wi-fi card will not function anymore.... but you can always install another WI-FI card in your laptop... you can buy a USB Adapter or a Cardbus(PCMCIA) adapter for this purpose...if you want your wi-fi signal strenth and range to be higher, you can opt to buy an adapter which comes under N standard....N standard wi-fi adapters are capable of connecting at a speed of more than 300mbps(practically) to any N standard device like router....
this are the drivers for a similar product ..but Im not sure what your exact model is ...you might try ..cause ussualy they use about the same sound driver for close models...its still a Compaq PC Laptop . http://www.zyxware.com/articles/590/drivers-for-compaq-presario-cq40-317tu-laptop-for-windows-xp anyway on the right bottom you will find similar and other models and links for drivers... have a great day! ps. if you still have issues...just comment and add the exact model ...name
please note that there are 3 possible wireless network cards in this laptop, I sugest you download all, and try each in the following order
remember to uninstall each driver if it is not correct
If you are runing XP, you will need to try and locate the relevant 3 XP drivers from the 3 manufactures sites EG: Intel
Not much offered at Compaq's driver site for XP. For the modem driver, try the link below, it says it's for Vista, but it should work. If it doesn't then you will need the make and model of the modem, then go to the manufacturer's site or driverguide.com for the drivers, and the same for the wireless, make and model, manufacturer's site or driver guide. To be honest with you, modems are just about obsolete, unless you have dial up at home, you'll probably never use it.