A:AnswerYes, this PCIe wireless adapter is compatible with your HP as long as it has a free PCIe slot. If you've installed any other PCIe devices in this machine then you should double check and make sure you have a free PCIe slot. To install this adapter you just want to make sure the card is physically seated properly in the PCIe slot and then install the drivers for this wireless adapter. This adapter is compatible with your Motorola Surfboard modem/router.
A:AnswerIf your PCIe slot is not occupied then yes, you can install this card into your system. Please note that you have only 1 PCIe slot and 2 PCI slots. The PCIe card does not work in a PCI slot.
A:AnswerYou could use this to replace your wired connection in a desktop computer IF you have a wireless access point or wireless router. I personally prefer wired connections because they are more secure and faster. The advantage to wireless access is portability. You can move your computer to a different location and not have to worry about moving the network cable with it.
A:AnswerAccording to ASUS the product comes with a low profile bracket you can exchange the full height bracket with.
Most likely there are two small Phillips head screws holding the bracket to the card.
A:AnswerProbably not any better then the XBOX itself does. You could try an expander that may work. You have to check to see if there is one compatible with your router.