**Make a copy of your WTF folder before you do this just in case**
Close down WoW. Go into your WTF folder in your WoW directory and delete all instances of prat.lua The WTF folder holds the settings information for all (I think) addons on a per account/server/character basis. You will most likely have multiple copies of that file. Once you have them all deleted, start up WoW again and Prat will be 100% back to default settings as if it was your first time installing it.
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