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Registry cleaners-good or bad?

I have three quick questions:

Are registry cleaners , such as CC Cleaner, helpful or harmful, a necessary thing or not? I have used the CC cleaner before, but I saw that MS recommends against them. Any comments?

Second: I see a Bios update available for my laptop, Dell Inspirion5000 series, 5459 qnd 5559. Is it a good idea to install this? Helpful or harmful? Necessary or not?

Third: an update for Intel Newtork. Same questions.

My laptop running Win 10 is working fine and I do not want to screw it up.


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