Actually SU stands for "Switch Users"... after the like named UNIX command. I won't touch it, preferring to use Task Scheduler instead. I do believe your issue is that of network right. The impersonated user needs the rights or else you'll have to copy all the files local.
Do the reg mods need to be in sync with other commands in your script? You know, you can do remote reg mods from an admin script. I do it all the time.
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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.
