Since it appears that this may be the last main expansion of Windows XP and the date is also impending when Microsoft will no longer be selling the retail versions of XP, it’s a very good idea for downloading the update and installing it again. If you haven't concerned about to download the updates for the last Service Pack, then I would highly suggest you that you can download and install this update from the internet. It won’t severely change the way which you work like the Windows Vista did, but it will also make your computer as secure as it possibly at the moment.