Hi !!! I've resolved the problem !!
For all who are using Minlogon and a frontend as Shell I've found a solution to don't have these error messages while shutting down and reduce the duration of it.
I have made a small program in C++ wich load the frontend and then sleep during infinite time.
Here the source code for people who want it :
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
ShellExecute(NULL, "open", "C:\\Program Files\\RoadRunner\\rr.exe", NULL, NULL, SW_SHOWNORMAL);
My program is named "shell.exe" and is located in C:\WINDOWS
So in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Shell = "shell.exe" instead "C:\Program Files\RoadRunner\rr.exe"
Maybe it's a "barbarian" method but it's works and that's essential
In attachement there is the file. You MUST have your rr.exe in C:\Program Files\RoadRunner else it will not load RR
ENJOY !! and one more time: sorry for my english ^^