Fauville,
Did you delete the last folder isntallation? Sometimes leaving old bits in the previous original folder will cause a new install to be messed up. (Its happened to me before).
You 'could' try renaming the FS9 folder to 'Backup FS9' folder, then selecting uninstall FS9, then reinstalling FS9 once more. This will give you a 'pure' install with no addons in it. White sheets, clean slate, no left over modules, gauges, effects, etc, that might be messing up your new install.
Just some humble advice.
Bill
LHC