Hello. Tried reading other post to solve this problem. The closest one I came to was Cinemagic's post last July when he stated a similar problem. I have successfully downgraded an Acer X1200 from Vista Home to XP Pro. Everything runs fine except that I have no sound. I've downloaded various drivers including RealTek but nothing seems to works. I keep getting a greyed out window in the "Sounds & Audio Devices Properties". As I mentioned earlier, everything else is running perfectly. Any help would be appreciated. If the problem gets solved I'll make available an image of the finished product and make it available for those who are interested. Thanks in advance.