I have a HP 7975. I recently took the old hard drive out,( it didn't work well), it had 80 g's.. I replaced it with a Western Digital Hard drive with a 120 g's. I formated the old Hard drive before I took it out and the HP had win/XP on it. Well anyway, I installed Win2k pro. Everyting works on it but sound. The computer says I am missing drivers for Ethernet Controller, Multimedia Audio Controller, PCI Simply Communication Controller, and Video Controller (VGA Compatible) Please Advise.