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Should I reformat new HDD

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OH Smeg

If you uninstall the software it will not all be removed and may leave some instances of itself in the system which results in the system being pointed to no longer present commands or similar which may result in it slowing down.

No matter what you never completely remove everything related to software that has been installed. If you want as clean as possible the best way is to wipe and reload with only the software that you actually want installed.