you encapsulated it all right there; you can trash most of it, but traces will always remain unless you're really good with computers. your computer has thousands of entries in the registry, and attempting to root out the ones you wish to get rid of without harming anything else is definitely "proceed with caution". back up the files you want to an external drive and reformat, if you really want to de-garbage. it's the only way to ensure 100% cleanliness.
