Feb. 2007 I bought an HP Pavillion that was advertised as Vista ready, all I had to do was send the form and get the upgrade in the mail. Well, I got it but am just now getting around to installing. When I insert the HP Upgrade Assistant, which the instructions say to do, I get a message that it is not compatible with this version of Windows. I have Windows XP Media Center installed on my computer. HP is now telling me I don't have to use the assistant disc before I install the upgrade but why would the instructions caution me to insert the assistant first? Has anyone else experienced this?