I ended up deleting the computer from my account, uninstalling trigger from pc and deleting the trigger directory user settings.
Lucky I had a copy of my settings/commands from my old pc. I copied across the file contents and it worked.
Has to be an easier as all that is technically changing is the MAC address?
Also, if u use my than 1 PC do u need to create a shutdown command for each PC and edit the voice command to include the PC name or and will it work by using 1 shutdown command and simply say "shutdown (computername)"
Thanks