You are unable to install the MS Service Pack 2 for Windows Xp. Well in this
case try the following steps.
Try to download the Windows Product key Validation tool to verify that you
are using the genuine version of Windows or not.
http://go.microsoft.com/fwlink/?linkid=52012
Once you will open the above link in your Browser, It'll ask you to download
the tool.
Download the tool & then install it. Once you'll install the tool it'll give
you information about either your product key is the 'Genuine' or not.
Now, I am considering that, tool depicts that you are using the Genuine copy
of windows.
Go to the following link to download the service Pack 2.
http://www.microsoft.com/downloads/...BE-3B8E-4F30-8245-9E368D3CDB5A&displaylang=en
Once the tool, is downloaded. Reboot the computer in to the Safe Mode & try
to install it from the Safe Mode, even you can install it from the Normal
Mode.
If the Windows XP is not genuine, better to contact your System
Manufacturer if the XP was preinstalled or purchase a new copy of Windows.
Hope this'll help
Rgds
Anurag