I recently downgraded an HP Pavilion DV6220TX running on Windows Vista to Microsoft Windows XP. I just thought it would go smoothly but to my dismayed the usual 1 to 3 hour work of installing an operating system and putting an applications turn out to be a one day work. The reason for me downgrading it to Microsoft Windows XP is the usual slow application response from Vista. HP Pavilion DV6220TX actually came with Windows Vista Home Edition pre-installed. But if you would compare it to another box with the same specification running on Microsoft XP the computer actually fly rather than drag. Anyways the trouble of downgrading it will paid off in the long run since more application are running smoothly and comfortably in this box. The drivers support for Windows XP from these line of models from HP are actually minimal. Probably putting all the effort for drivers support in Vista after all Microsoft will slowly phase out XP I hope not. In my view HP should at least provide support for the other Operating Systems for backward compatibility after all these lines of computer performs better in other operating system other than default.