Scotennato99 and I solved the problem adding an extra step to what Dss0 suggested, as we're both using Windows 10.
We went to Settings > System > Display >Graphics Settings; we selected C:\Users\YOURUSERNAME\AppData\Local\Plutonium\bin\plutonium-bootstrapper-win32.exe as a special executable and set the option to make it run with the NVIDIA card only.
This worked.