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Windows XP Tips, Illustrations and registry edits
What are the Pre-requisites for installing Windows XP SP2 in my system?
The hard disk space requirements
for Windows XP Service Pack 2:
http://support.microsoft.com/default.aspx?kbid=837783
Do I need to install Windows XP Service Pack 1 before installing the Service Pack 2?
No, Windows XP Service Pack 2 includes Service Pack 1 and it's a direct replacement for Windows XP Service Pack 1. Service packs are cumulative. This means that the problems that are fixed in a service pack are also fixed in later service packs. For example, Windows XP SP2 contains all the fixes that are included in Windows XP Service Pack 1 (SP1). You do not have to install an earlier service pack before you install Windows XP SP2.
Similarly, you don't have to uninstall Windows XP Service Pack 1 before installing Service Pack 2.