What's with the triple hacks?
USE Z: "\\\IT Folders"

You talk about copying DLLs and then I see Z: drive map. Either you don't understand DLLs or you don't understand about the Z: drive or both. DLLs are exclusively for Win9x/ME and Z: cannot be mucked with in a logon script on WIn9x/ME.
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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.