Hi,Recently I deinstalled FS9, defragmented my partition and re-installed FS9. I removed all other programs including PMDG 747.Trying to re-install the 747 the creates the following message:"The setup has detected that version 1.02.1800 version 1.01 is installed. This setup installs an earlier version (1.01).You will have to uninstall the previous version before installing this version."I guess there are some registry entries to remove. Or is there another way to unistall?Thank youWalter

That sounds like the culprit. Just deleting the files doesn't necessarily remove it from your PC.