Most users of Windows XP are using Windows XP service pack 2.
You can upgrade Windows XP service pack 2 by installing plain service pack 3.
This will upgrade and improve functionality to your current installation to Windows XP.
There are alot of versions of Windows XP Service pack 3 but i recommend downloading an official version from Microsoft's downloads center through the link below.
To after download is complete, install the file. Installation takes about 10 to 30 minutes depending on your system specifications.
If your current installation of Windows XP has too many errors, installation of service pack 3 may not be successful.
The solution to this is to reinstall your Operating System (OS) using your OS installation CD, then install Service pack 3.
How ever, OS re installation will erase all your data in your system partition so back up all your data.
To download an official copy of Windows XP service pack 3, follow this link:
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