SiteMinder installation says error removing virtual directory despite running under Administrator account?

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http://serverfault.com – I keep getting this error: "Unable to remove virtual directory: siteminderagent" "An error occurred while deleting a virtual directory. The following error was returned by the CoCreateInstance function: An unexpected error occured." (Note that prior to running this install IIS 6 is at default configuration from a normal install of Server 2003, just the Default Website and what not.) That CA describes like so: Metabase error: -29187 will come when you try to configure the siteminder Agent using a non privilege account, So request you to please use the account having the (HowTos)