Some people on other forum practice threads are having issues with Duenna - the first time they use it on Windows Vista.I would strongly urge you to install Duenna into a folder outside Program Files. I've learned my lesson and everything about Flight Sim on my Vista computer is installed into a folder named C:MicrosoftGamesDuenna works best when set to "Run as Administrator" and runs best in the Win XP SP2 Compatability mode.But in any case - 1. right click on the Duenna folder - FS-Addons - 2. select the security tab3. click on the Users group4. if that group does not have Full Control rights5. click Edit6. click on the Users group7. click Allow for Full Control8. click OK and OK9. open FS-AddsonRTW-Duenna10. right click on the Output folder, choose the Security tab and verify the Users group has Full Control of the folder

Thanks for the heads up Reggie