I have been using Windows XP professional on a computer I built since late June, without problems. When I went to the Windows XP update site to obstain the XP Serive Pack #1 I received a message that the key was invalid and that the edition I installed on my computer was likely to be pirated. I have since purchased a valid edition of Windows XP Professional but am not sure whether it actually needs to be installed or whether I just have to call Microsoft with the valid key. If I need to install it can I do so without losing all my settings, and will the installation from the new, purchased CD "validate" the operating system?