Only 64-bit drivers are supported in Windows XP x64 Edition, but 32-bit codecs are supported as long as the media player that uses them is 32-bit.

Is Windows XP Professional 64-bit or 32-bit?

For a 64-bit version operating system: Windows XP Professional x64 Edition Version appears under System. For a 32-bit version operating system: Windows XP Professional Version appears under System.

Does my processor support 64-bit?

You can see whether you have a 64-bit or 32-bit CPU in Windows by opening the System Information window. If your System Type includes x86, you have a 32-bit CPU. If your System Type includes x64, you have a 64-bit CPU.