Well, I have never seen anything like it before. But you can try to delete everything in the registry.
Open "Regedit" and navigate to "Computer\HKEY_CURRENT_USER\SOFTWARE\GrizzlyGamerStudio\Robin Morningwood Adventure" and delete everything in there (or just delete the folder.
It won't touch your save since it's located in the appdata folder 'C:\Users\USERNAME\AppData\LocalLow\GrizzlyGamerStudio\Robin Morningwood Adventure" as "saveX.rma" ans "SaveInfos.rma" (you can backup these if you worry)