I had just purchased a new HP Pavilion A6009N desktop here. It came with windows vista on the same. It came pre-installed here. And I simply formatted the pc and installed windows xp on the same. But somehow there is a problem with the pci drivers. Some hardware in device manager are not installed. I tried to connect a lan card to the system but it is not detected. What should I do here. I want to use Windows XP here because I am not really use to Vista.