http://msmvps.com/blogs/kenlin/archive/2009/01/05/the-xps-essentials-pack-has-been-updated-to-support-windows-xp-service-pack-3.aspxThe XPS Essentials Pack installer (available via www.microsoft.com/xps ) does not currently support Service Pack 3 (SP3) of Windows XP. To enable XPS support on Windows XP SP3, you can install the XPS Essentials Pack prior to upgrading to SP3. In theenCommunityServer 2008.5 SP2 (Build: 40407.4157)