Installation on windows NT 4.0

[HUGON-JEANNIN Yves]

Hello,
I have installed Cygwin on MS Windows NT 4.0 and it works good. After that I
have installed XFree. I have tied a lot of things during two days to obtain
something, but the only result is a grey screen with a 'X' cross. The mouse
doesn't work. Sometimes I have an xterm but without any way to access it (I
have tried all the keyboard keys and all the mouse buttons !); I have
changed th path in the "startxwin.bat" file and that suppres the errors but
still doesn't work. 

I have a message about an xserver : "error opening security policy file
/usr/X11R6/lib/X11/xserver/SecurityPolicy"

If you could help ? I don't see anything more to do.
Excuse my poor english
Thanks

Yves HUGON-JEANNIN