THis has been discussed several times already, and it's not a problem with any of our programs but, instead, a problem of your Windows installation, related to the MS Visual C++ runtime libraries, which the Couatl.exe program requires, that are missing/corrupted or the wrong version.
Try to follow all the solution proposed in this thread:
http://www.fsdreamteam.com/forum/index.php?topic=6754.msg58130#msg58130In this case, what fixed the problem for that user, was creating a new user account and run FSX and GSX on it, which was clearly an indication that something was wrong in his Windows install, and creating a new user fixed it in some way.