Possible security and software issue with pc

I am currently experiencing a variety of software issues and i also suspect that my pc is currently infected or hacked because my memory usage is high and random apps that are not supposed to be running are running and I have other reasons to suspect this may be the case. Screen bugs and crashes keep on getting worse so i am not sure what may be causing it as i just got this pc and all drivers have been updated as well as a clean install of windows. I would greatly appreciate the help in identifying the cause and help fix the issue. 

Thank you! 

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