I just said that I did all of those things... else I could do? I really need GSX to work.
Then you must have not made some step, or made it in the wrong way, or not made it, otherwise the problem would have been fixed by now since, as I've said, the only possible reason why GSX wouldn't start, are either the antivirus or the missing VC++ libraries.
About the VC++ libraries, you might have to uninstall/reinstall ALL 6 versions of them, which are:
- The VC++ 2005 SP1 redistributables, both in x86 and x64 versions.
- The VC++ 2013 redistributables, both in x86 and x64 versions.
- The VC++ 2015 redistributables, both in x86 and x64 versions.
Try a Windows restart after reinstalling each library.