When I uninstall some app, I run after that CClener registry fix, and have list of findet isues. How can I know which items are important for OS, not to delete him?
It would be nice to have choice, "Keep system registry items and delete rest".
There is a backup feature/option before it deletes anything from the registry, as long as you haven't disabled that option. It will backup to a .reg file that when double-clicked will put the items back into the registry - but still you're better to create a System Restore Point before cleaning the registry with any tool.
Ok, but System Restore will back also unnecessary items.