Interactive command prompt as NETWORK SERVICE

Here is how you would use PsExec to run cmd.exe under "NETWORK SERVICE" user context:

psexec -i -u "nt authority\network service" cmd.exe 

Have you tried PsExec, a couple of interesting links with more information:

• http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx
• https://social.technet.microsoft.com/Forums/en-US/381df759-af7f-4523-a2fd-b17e8c68db9e/how-to-start-cmdexe-as-network-service?forum=pstools