Media Center Master keeps most of its configuration in the Windows system registry in:
HKEY_CURRENT_USER\Software\Peter Souza IV\Media Center Master
Some legacy settings are also stored in:
%ProgramFiles%\Media Center Master
If you are running a 64-bit version of Windows, it will be in this folder instead:
%ProgramFiles(x86)%\Media Center Master
In that folder you will find the following file:Media Center Master.exe.config
(sometimes it's Media Center Master.config
This is where some of the default application settings, preferences, scan folders, etc. are saved. When preferences change, this file will remain unchanged, but instead a registry update will occur. So to default to original settings, you can delete the entire registry key for Media Center Master.
Media Center Master also keeps a list of movies it has downloaded and T.V. episodes in your library and that have been downloaded so that it knows what to download and what to skip. These files are located in:
%APPDATA%\Peter Souza IV\Media Center MasterMovieDownloads.csv
This is a list of movie downloads that Media Center Master has downloaded for you.TVDownloads.csv
This is a list of TV episode downloads that Media Center Master has downloaded for you and additionally what TV episodes you have in your collection (so therefore it will not attempt to download).
You will need to fetch meta data for all of your TV series for the TVDownloads.csv to have a proper list of what's in your library.