It finally works, that's what I did:
1) Uninstalled completely nHancer and Nvidia drivers (to uninstal nvidia drivers i used "driver sweeper 2.1.0" tool)
2) Rebooted
3) Installed nVidia lastest drivers.
4) Rebooted
5) Installed nHancer and configured it
6) run FSX
7) crossed my fingers


I hope this can be helpful for some1 else, thanks a lot for your replies, expecially the last one of olderndirt that made me try and retry with a bit more of hope!!



