Thanks Dominic, in fact I tried with the FS9.exe original but doesn't work either

any suggestions how to reinstall FS9 I mean is possible to do it with theses following steps if I have enough HD space:
1. Locate the current FS9 folder and rename it to something like FS9_org
2. Start the install from the CDs using the same name you originally used if other than default.
3. Start the newly installed copy once to make sure it is working ok then shut it down.
4. Copy the entire Aircraft and Gauges folders from the FS9_org to the new FS9 installation.
But I'm not sure for the scenery, I mean is possible to copy or is better reinstall too

Thanks again
