Pete,
Interesting... You say PDM user has rights. Is PDM user a service account or the logon user? If a service account, local or domain?Just a thought... I've never used SU but wonder if you could run it under the PDM user priviledge and just shell out and use deltree (DOS command) the files away. Keep temp, just delete everything beneath. That way you need not be concerned with changing file/folder permissions. Also since it doesn't have administrator rights, you have no big security hole.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
