I've just did a clean install of Windows Vista 32-bit on a new hard drive using an actual Windows Vista disc and installed the drivers first to get internet access. I have set the correct date and time as well as correct time zone (I live in Central Time Zone) and when I tried entering the product key (yes it's the correct product key), I get this error code 0x80072F8F and I clicked More Information and it says "A security error occurred" in the description. I even replaced the CMOS battery with a new battery and synchronized the time after setting it to the correct date and time and still get this same error when I tried to activate it. Phone activation is no longer available for Vista. I can install updates with no problems though. It's just I can't activate it. I changed MediaBootInstall from 1 to 0 with regedit and still no luck. Am I missing something? Any ideas like step by step instructions?