i read in some of the rivews that i have to disable my antivirus
Well, it wasn't really "some reviews": I told you to do that, in the email exchange we had yesterday night at about 1:30 AM...
It looks like something keeps Modifying the Coualt script or something like that
This can be either the Antivirus or, as reported by some users, the "ATI Tray Tools" utility when the "Automatic Overclock" function is enabled. If that's the case, and you can't fix it by disabling the antivirus, be sure you either close this app before running FSX, or disable the "Automatic Overclock".