Trying to run nvreport or any NetVault executable from CMD or PowerShell returns "Access is denied."
To find a version for your PC, check with the software publisher"

An anti-virus or GPO may be preventing the executable from running.
Or the executable may be corrupt (showing a size of 0 KB).
If the executable is corrupted. It can be copied from another installation on the same version.
If an anti-virus or GPO is preventing the execution then an exception needs to be made for the executable.
If the executable is corrupted. It can be copied from another NetVault Server from the same version. If there're any difficulties with this please open a Service Request for support to provide the executable from the required version.