Well,Umberto GSX old version is working on my system, but new version is not working.
New version is 32 bit compatiblity?,İf so I will convert my system 32 bit
You don't seem to understand. The FSX version of our software was 32 bit before, and it's still 32 bit now and it always worked with a 64 bit OS. The only difference is that requires a NEWER version of the VC++ runtimes and because you have a problem with the newer version of the VC++ library NOT with GSX, that's why you get that error.
And, you don't say exactly in which application you get the error, you only say it's "hen I running Fsx I get this error" but what does it mean ? Are you able to identify which program is giving you that message ?
So, downgrading the OS to 32 bit doesn't make any sense. Reinstalling the OS WILL probably fix it but, it can still be 32 bit. Again, since Windows 10 is a FREE upgrade for Windows 8 users, I really don't see the point of staying with Windows 8.1 or, even worse, downgrading it from 64 bit to 32 bit, which will result in serious memory problems, since you won't be able to use more than 4GB of ram IN TOTAL (not by app!).