Before you look for the latest Service Pack for your Windows installation, check which version of Windows XP you are running on your computer. In order to do that, type the command winver in the Run dialogue box (Start -> Run) and click OK or hit <<Enter>>. Windows XP Service Pack 3 (SP3) is the latest Service Pack for Windows XP, but before you install SP3 in your computer, you should have SP1a or SP2.
The easiest way to get hold of the latest Service Pack for your Windows installation is to turn on Automatic Updates and let your computer take care of everything else. Of course, you need to be connected to the internet for this to happen.
1. To turn on Automatic Updates, right-click on the ‘My Computer” icon on your desktop and select Properties (or just go to Start -> Run and type in sysdm.cpl and click OK or hit <<Enter>>). Click on the Automatic Updates Tab and select the Automatic (Recommended) option. You can also choose when you want the Automatic Updates to happen under automatically download recommended updates for my computer and install them and then click OK.
2. You can also visit the Microsoft Updates website at http://windowsupdate.microsoft.com and select the Express (Recommended) option and select install.
3. You can also download Windows XP SP3 directly to your computer and install it, if you are sure that the minimum requirements are met for this to happen. You can get Windows XP SP3 from this location.