What are all the parts needed to be deleted to make a fresh install?

I have seen many threads that have problems with Filter Forge for many different reasons, and the suggested best and easy solution is to uninstall and reinstall again.

BUT then after reinstalling the problem KEEPS the same, and this is because some parts of FF have NOT been deleted and have kept the same.

So please, What are all the parts needed to be deleted to make a fresh install?

For fresh install I mean to leave the computer as it have never been installed FF

OR at least to delete all the folders that could hold FF data, because to have to have an absolute fresh intall tootally new would be much more difficult as would need to do a registry and I think this is not recommended neither needed probably

Thanks for your answer GMM, but I already know this, and seems that I have made wrong or incomplete the question, as this is not really what I was asking.

Because if you uninstall all FF is recommended to make a backup of all the filters library, data and configurations inside the %Appdata%\Filter Forge 3\ and then after delete it

BUT what I mean is that after reinstalling you want to copy again back the backup you have made and you copy ALL the %Appdata%\Filter Forge 3\ to the new installation

AND HERE is where can happen the problem, the error that have made you reinstall the whole FF is BACK !!! Because it was included inside the %Appdata%\Filter Forge 3\

So my good question is WHAT files or folders can be deleted of the backup you have made of %Appdata%\Filter Forge 3\ to avoid having the same problems again

Thanks very much for your help