Click on Start, Run and type: C:\XPSP2.exe /integrate:C:\XPCD
The /integrate switch tells the service pack file to integrate with the folder at the root of the C: drive.
Please ensure the location of XPSP2.exe and the XPCD folder are specified in the above command. For example if XPSP2.exe is located in My Documents the command will be: [for Windows XP]
C:\Documents and Settings\[Username]\My Documents\XPSP2.exe /integrate:C:\XPCD |