From Birnam Designs Wiki

Some top-level functions are not even capable of being handled by administrator access. Some need system level access.

Download the sysInternals tool PsExec, part of the PsTools.

Open powershell or the cmd prompt with administrator access. Run:

C:\PsTools\psexec.exe -i -s c:\windows\System32\cmd.exe

(edit depending on the location which you have downloaded psexec.exe)

Or you can run regedit like this:

C:\PsTools\psexec.exe -i -s C:\Windows\SysWOW64\regedit.exe