Could you tell me where the files of JFKv1 where installed to? Were there files installed to Scenery/World/...?
This thread has a complete list of folders for JFK V1:
http://www.fsdreamteam.com/forum/index.php?topic=8504.0Of course, they are supposed to be removed by the JFK uninstaller, but you can have a look and remove them manually, if they are still there. There are no other files outside of these folders.
Because I use a Ramdisk for some directories and maybe there are old JFK files on the image. I am very sorry for this (looks like the ramdisk brings more trouble then benefit...)
Yes, a Ramdisk doesn't have any sense nowadays. Even if FSX doesn't use more then 4GB, Windows uses extra unused RAM for file caching automatically and the file caching made by Windows it's faster than mapping a Ramdisk, the only "benefit" is that with a Ramdisk you can choose what to cache, by other than that, there will be no benefits and just problems.
For example, all our sceneries only runs from the folder they are installed to. You can't move them easily between folders and drive letters.