An unknown error has occurred in the WMI Provider. Error code 80040219

If you are working with Reporting service and do see couple of Instance ID on SQL 2005. Most probably you might had deleted, moved or rename any of those Instance ID.

Ex: If you see MSSQL.1 and renamed to MSSQL.3 to make Reporting service configration Manager to show only one instance. This error will show up...

Refer to below link to help resolve this issues.

http://support.microsoft.com/kb/909967
http://blogs.msdn.com/astebner/archive/2005/09/13/465401.aspx
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=354408&SiteID=1