Tried it and still the same problem. I have the nitrod installer app installed but i have not yet installed the OS. Could that be a problem?

I tried to uninstall the nitrod installer but i cant. I dont get the option to uninstall it from the app manager. When i tap the nitrod installer package in the app manager, under the uninstalling tab it says "Unable to uninstall Nitrod installer".

Any suggestions please?