Unified Controller Vm series Controller typeS / typeL Virtualization Functional Manual   
  2.2  Disable Shutdown 
  If you inadvertently shutdown Windows, Windows will not start until the typeS / typeL 
itself is restarted. That is, if you inadvertently shutdown Windows, Windows will not start 
unless PLC / DCS is temporarily stopped. 
  To prevent misoperation, the recommended setting to disable shutdown is as follows. 
 
  Sign in to Administrator and follow the steps below. 
Right-click  on  the  start 
button and select the [Run]. 
Enter  "gpedit.msc"  and  click 
the [OK] button. 
The  [Local  Group  Policy 
Editor] appears. 
Expand the  tree  under  [User 
Configuration]  – 
[Administrative  Templates]  – 
[Start Menu and Taskbar]. 
In  the  list,  double-click 
[Remove and prevent access 
to  the  Shut  Down,  Restart, 
Sleep,  and  Hibernate 
commands].