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sam kamFlag for Lebanon

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Registery misunderstanding

Sometimes I need to delete the registery of the each software manually since some of them left some registery keys for unknown purposes.
Please inform me why some software leave some registery keys after uninstall and how to understand the hierarchy of registery and how to recognize if there is a virus in these registery please.
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John
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There appears to be an assumption by some vendors that you may reinstall the software.

I do not use or recommend registry cleaners for this purpose. The aggressive cleaners (or aggressive use of any cleaner) often create more problems than they solve.

If you are using good software, uninstalling is generally not a problem.
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Thank you John,
As you know some software are making problem when you uninstall it because they leave some registery keys. And I want to understand how software place registery keys. Would you help me to understand the following:

HKEY Classes root, current user, local machine, users and current config
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BillDL
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I just mentioned Local Software as it covers all / most of that above.

But the CLASSES stuff is pretty much off limits because of the precision of knowledge required.
Hello sam kam
Do you have any other questions or things that need further explanation?
Are you facing any issue? Which you can share.
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I believe that the comments from the experts listed answer the question asked.
Thank you db