I did a reformat of my HP 522n desktop, now I have no sound. The drivers are gone, my control panel says no sound card detected (it is integrated audio). I tried to download a new sound driver from HP but after I unzip the file, it says "no driver found, must restart) or some **** like that. Did I wipe all my drivers for chipset and everything else?? How can I make sure ALL my drivers are installed?