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:

[fltsim.0] title=CS_B707-300 Paint 0 sim=csx701 model=adv panel= sound= texture=panam kb_checklists= kb_reference= atc_id=N885PA atc_airline=Pan Am atc_flight_number=701 atc_heavy=1 atc_parking_types=GATE,RAMP ui_manufacturer=Boeing ui_type=707-300B ADV ui_variation=Pan Am ui_typerole=Commercial Airliner ui_createdby=Captain Sim description=707-321B ADV Jet Clipper Northern Light (20024/776)\n707 Captain (707-300) 1.3\n(c) 2011 Captain Sim www.captainsim.com

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.