What does it mean if my version of Windows is no longer supported?
An unsupported version of Windows will no longer receive software updates from Windows Update. These include security updates that can help protect your PC from harmful viruses, spyware, and other malicious software, which can steal your personal information. Windows Update also installs the latest software updates to improve the reliability of Windows—new drivers for your hardware and more.
You should always install the latest service packs for Windows . You can download and install these through Windows Update.
Support end dates
Here are the dates when support will end for PCs running Windows XP.
•Support for Windows XP is ending on April 8, 2014.
There's no SP3 for the 64-bit version of Windows XP. If you're running the 64-bit version of Windows XP with SP2, you have the latest service pack and will continue to be eligible for support and receive updates until April 8, 2014. To find out what version you're running, see Is my PC running the 32-bit or 64-bit version of Windows?