I might would upgrade if I trusted Microsoft a little more. Please quit the installer and install on a supported system' in plain English terms, if you will. In this case, is there a way to still get it to run or is this Microsoft's method of saying: 'This product does not run on Vista SP2.' I thought I might add Virtual PC said for Home Edition that it 'wasn't supported', yet it still ran. I thought that I might add I have tried to install this on Windows XP with Service Pack 3 installed, after which I get the message/dialog reading 'Windows Internet Explorer Platform Preview does not support any operating system earlier than Windows Secondly, would Microsoft ever accept porting IE9 to Windows XP-and if not, why? I'm genuinely Windows XP is still a popular OS by usage, though Windows 7 has been widely accepted as the OS of choice, and Windows XP still is an option on most notebooks. Would it be possible to put Internet Explorer 9 on Windows XP Home Edition or Professional with Service Pack 3-officially?