I've dug a bit deeper into the problem today, and the solution so far seems to be:
- The delnvc.exe must be on local disk at the computer (not using unc-path)

- I tried using authentication through a user on the domain, instead of using a local admin on the computer.

To sum up:
When the exe-file is placed locally on the computer, along with using a local admin (eg. @wksta\administrator) everything works ok.

Then I guess I gotta make a script which generates a locally user with admin-privileges to use in the script.

Jon
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I was placed on earth to do a job. Right now I have so much to do, I will never die..