Something must be different in the environment of the two workstations, please try checking the "Log command-line constructed for call" checkbox on the Options tab of the NUnit step, then execute this command-line manually from a cmd prompt to determine what is not working properly on the workstation receiving the error.
Without more info I would guess that nunit-console.exe is not found by Visual Build Pro, perhaps due to a path not being in the Path environment variable or because NUnit is installed to a non-standard location?
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