Replace the shell with mpc is what I did. Basically tell Windows to not load anything other than m-pc.
Before.doing this you need to do any config you need for networks etc as you will not be able to access control panel (properly) after as elements of the shell are needed.
This is only recommended if the pc is only used for m-pc! You will not get any windows updates or Anti Virus protection (however if the computer Is never connected to anything then risk is minimal).
The reg key your looking for is;
Then change the shell key to point at maxxyz.exe (full path)
I use this setup on a Dell XPS 13 Touchscreen, with an M-Touch & M-Play using 1 universe, with a Wireless AP for IPhone Access running a touring rig of 14 moving lights, 12 source4's and various LED batons and suchlike with no issue.