We don't know what people said what stuff to you, so that's not really a useful fact.
https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/high-cpu-usage-null-process/99975884-cffa-46cf-8bbb-e08bf6f774ed seems to recommend a repair install of Windows 10. Worth a try.
I did all the stuff people said but when i click go to services nothing is selected? can someone please help me get rid of the Null process it doesn't let me open up files.

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