Hi Paulie,
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The OpenLP data is stored separately from the program, so re-installing it does not remove the data and settings.
To remove the data you have to remove (or move) the data folder. You can find the data folder by using the OpenLP menu: Tools -> Open Data Folder. Once the folder has opened in the file explorer you can close OpenLP and move or delete the folder.
The settings are stored in Windows registry database, and has to be deleted from there. To do this open "regedit" and go to "HKEY_CURRENT_USER\Software\OpenLP\OpenLP" and delete the entries there.
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Note that you can export and import settings from OpenLP so you don't have to remember every setting when you install on a new box.