1. You can download it and install it. 2. You can slipstream it, and upgrade your existing XP. 3. You can slipstream it and do a fresh install. The top 2 options preserve your installed XP, while the last does not. The 1st is suitable, but it advised to backup, in case it does not work as expected. Else the other options may need to be used. To slipstream into the source is one command. WindowsXP-KB835935-SP2-ENU.exe /intergrate:<path to source> Good luck.