Welcome, Lorenzo.   Sorry to hear about those problems. Can you do me a favor and look into the aircraft.cfg of your 707? Find it at SimObjects\Airplanes\CS_B707-300. Open it with a text editor and post some entries like [fltsim.0] and rising numbers.
The line where it says sim=csx701 is very important, so lets just check what is missing there.

Additionally, can you confirm running the version 1.3 of the 707 for FSX? The installer name is csx701_1300.exe.
Does your FSX have at least SP2 installed?

No problem. I'm just looking for some entries in the file which defines the aircraft for FSX. It's called aircraft.cfg and it's located at FSXfolder\SimObjects\Airplanes\CS_B707-300. If you open it with e.g. Notepad (you can choose it with a right click on the file), you will see a lot of text, separated by chapters.

Some of those chapters have [fltsim.0] as title (or another number, instead of '0'). Those are the entries FSX is looking at for e.g assigning the right flight model or repaint to your plane. Now you spoke about an error message which says 'couldn't start flight model' or something. This points at some mixed up entries in those sections, namely in the line where it says sim=csx701.

Here's an example from my system.
Quote:

So look for those entries and post a few of them. Take the first three or so. That's [fltsim.0], [fltsim.1] and [fltsim.2].

Now while I don't know why the installer mixes up those entries, I want to check if this really is the cause of the FSX error message. For this, you would have to post some of those [fltsim.0] entries.

As a general tip on installing the plane, always make sure to right click the installer and then select 'run as admin', to avoid any problems with lacking Windows rights. Also, it's a good step to temporarily disable your antivirus in place. You can trust the Captain Sim installers, so this isn't a security hazard or something. Just make sure to enable it again after installing.

Hi ;Ark I did all the things you suggested me buy it is still not working..it is something unbelieveable, I bought it yesterday..I really want to fly it but it seems impossible..do you have another suggestion?

Thanks

Lorenzo

had this exact problem and a complete and thorough uninstall and reinstall helped Goto >Your Profile>Customer Support>Search KB, and search for KB#685 . I had the same issue as you with the O being there instead of a 0 changed it to the 0 and still same issue, a reinstall fixed it for me.

Did you remove the 707 entry from the Windows registry? Don't just follow the reinstall instructions in KB #685. Do everything it tells you to for uninstalling it first, THEN follow the reinstall instructions.

Mark

Have you tried reinstalling SP2? I only ask because I suspect that SP2 for FSX may be corrupt. You might even want to consider repairing FSX, then reinstalling both SP1 and SP2.

loloi87 wrote on Jun 9^th, 2012 at 11:52am:

If I suspect that I have a problem with FSX or Acceleration, I usually run a repair of FSX, then a repair of Acceleration. I do this because the FSX repair will revert my FSX back to RTM, so I then have to repair Acceleration to get back to what I had.

I rarely choose to just repair Acceleration, because a problem might not be a part of it, but a part of the original FSX installation. So as I recommend a repair of both FSX and Acceleration.

Mark