We reinstalled Windows XP Home after hard drive crash. The system now shows as XP Pro and we're constantly getting 'invalid software' popups, images show in solid black. We called Microsoft, they said the serial number is valid etc. We're assuming that the pop ups are because that it is now XP Pro instead of Home. Or could it be something else? Or how can we determine what the issue is in order to correct it? Thanks for any advice on this. jb