If you installed XP from a CD and then copied the installation discs to your hard disk, use this hack to change the default installation folder that XP will look for when it searches for additional setup files later.
Navigate to:
HLM\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Setup
Change the String Value called SourcePath to one specifying the path to where the XP setup files are now stored. When you next need to access any setup files, XP will first look in this new location, instead of you having to click “browse” and browsing to there.
