By manually deleting those EPG files you’ve left you server in an inconsistent state. It’s already identified the tuner and associated it with a DVR, but you’ve removed the backing data for the DVR itself.
To correct this you’ll likely need to make some database modifications to fully remove the DVR and tuner. Here are the steps (this is off the top of my head but should be correct).
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Delete the existing DVR in Plex’s server settings, if it’s still there.
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Stop Plex Media Server.
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In a command-prompt window, navigate to the Plex data directory (the same one from which you deleted the files previously).
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Run the following command (assumes you installed PMS in the default location, adjust as necessary):
"C:\Program Files\Plex\Plex Media Server\Plex SQLite.exe" com.plexapp.plugins.library.db "DELETE FROM media_provider_resources;"Running this after should return no rows:
"C:\Program Files\Plex\Plex Media Server\Plex SQLite.exe" com.plexapp.plugins.library.db "SELECT * FROM media_provider_resources;" -
Start PMS and attempt to configure a new DVR.
I hope it goes without saying that you should back up the database file in the command above before modifying it via a query 
. Personally, I’d back up the entire Plex data directory.
