If you have been prompted to upgrade by Windows XP Service Pack 1, at this point you may be able to manually select and install Windows XP Service Pack 2.
Installing Windows XP Service Pack 2 is simple - launch Windows Update, either via the Windows Update button on your desktop, or by visiting Windows Update on the internet.
As many users know, Windows XP Service Pack 2 is a highly-intrusive system application that installs many new and upgraded features over the previous Windows XP Service Pack 1.