Hello again, the truth is that this problem is to go crazy, I've uninstall and reinstall the 757 and continue listening to the engine noise just outside the aircraft and the engines stopped.
Best of all is that I solved it when that windows 7 does not ever ask me that I have permission to copy, move, delete etc..
As if someone is interested to write on START ( inicio ) and check it UAC and never say you do not have permission.
frangollo :o 8-) ::) :-/ :)