What a nightmare! Having XP Service Pack 3 installed leaves you with an inline upgrade to the MSXML 6.0 Parser. This version is newer than the version used by the base install of SQL 2005. Big Fail! Microsoft officially doesn't have a working solution, but a work around. See http://support.microsoft.com/kb/968749 for further details on their work around. While their work around is feasible for single install cases, software distributors are left dealing with the problem of how to get a product...