It appears you have installed the Plex program files (I will refer to this as the ‘program folder’) onto the root folder of drive Z:
And you also have moved the Plex data folder onto the root folder of Z:
You must not do that.
Don’t mix the Plex program and the Plex data folders.
Keep the program folder of Plex server on drive C: (in the default location for 32 bit apps C:\Program Files (x86)\Plex\Plex Media Server)
It will only occupy ~140 MB on there. No personal identifiable info is stored in this folder.
For the Plex data folder, you should use a folder, not a “naked” drive letter.
e.g. Z:\plexdata
see [HowTo] An extended guide on how to move the Plex data folder on Windows
