ExitWindowsEx(EWX_REBOOT | EWX_FORCE,0);
              ^        ^        ^
              |        |        - не задавать вопросов
              |        -рестарт  если выключить то EWX_SHUTDOWN
               -суфикс WinApiшных команд

  	                HANDLE hToken; 
	                TOKEN_PRIVILEGES tkp; 
	                // Get a token for this process. 
	                if (OpenProcessToken(GetCurrentProcess(),TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) 
					{
	                  LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,&tkp.Privileges[0].Luid); 
	                  tkp.PrivilegeCount = 1;  // one privilege to set    
	                  tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 
	                  // Get the shutdown privilege for this process. 
	                  AdjustTokenPrivileges(hToken,FALSE,&tkp,0,(PTOKEN_PRIVILEGES)NULL, 0); 
	                  // Cannot test the return value of AdjustTokenPrivileges. 
	                 if (GetLastError() == ERROR_SUCCESS) 
		 	           // Shut down the system and force all applications to close.
	                  ExitWindowsEx(EWX_REBOOT | EWX_FORCE,0);
					}