Many of the games released today make use of DirectX 10 for better gaming performance and graphics, however Windows XP does not have official support for DirectX 10.
However if you are looking to download DirectX 10 for XP and enjoy newer games, you can do it by downloading a unofficial version of DirectX 10 created by the KM-Software DirectX team or the Alky Project.
Download the DirectX 10 setup file run it to install. During installation, you can choose whether you want to install DirectX 10 version from Alky Project or DirectX 10 version from KM-Software.
We advise you to create restore points for your system before you install DirectX10 for your system, if you are unsure how to do it, you can read our guide on creating restore points in Windows XP.
Download DirectX10 for Windows XP (link removed)