I had to replace my hardrive and purchased the XP Professional OS, my former system was XP Media Edition that had come pre-installed in my HP 1170n Desktop, and I could not re-install the Media Edition on the new drive. So, installed the new HD and installed XP Professional, booted up and everything is great - but I have NO sound, No system sound, and according my Device Manager - NO Sound or Audio Device at all! I looked under controlpanel/system/sounds and it is all greyed out, showing no device. The speakers were working fine and are less than a year old - Cyber Acoustics 3000 3-piece. I found some mention of others having the same problem and want to fix this the right way.