The plex data folder is in a different location from where the Plex program executables are stored.
It looks like this:
Maybe you can still find a folder which has these subfolders in it. If you do, move it to a safe place on a local drive which is formatted with the NTFS file system.
Plex can then be instructed to use this folder for its data. (Start with step 4 of this HowTo [HowTo] An extended guide on how to move the Plex data folder on Windows )
