Windows Defender can't turn on and Disk in task manager and Laptop Buzzing and Vibrating

[A Spicy Noodle]

I'm not very good with computers but when I try to turn on windows defender it tell me ''This application has been turned off and isn't monitoring your computer.'' ''If you're using another app to check for malicious or unwanted software, use Security and Maintenance to check that app's status.''
I used to have Mcafee because it came preinstalled with the laptop but then I removed it from the control panel's uninstall area. I didn't select the remove all files box and uninstalled it. When I go to windows (C: ) and type in Mcafee it shows some files and when I try to delete them it says that it can't. I also downloaded Avast before but uninstalled it using control panel as well. I typed it in windows (C: ) and it shows a file but I'm not sure if it's to do with Avast I can send a picture.Disk in task manager has been going up to 100% whenever go on another site or open a program it goes to 100% and is at the top of the list. System in task manager has gone up to the top a bit aswell. I don't know if this has anything to do with it but I right clicked on system and clicked properties and it says that it was created on the 10th of May 2017 and modified on the 28th of April. I have had this laptop for over 2 years.I'm not sure if this is because I used it for too long but I tilted to laptop back a bit and it made a buzzing sound and started to vibrate because of the sound, it wasn't very hot aswell.

 

[A Spicy Noodle]

Why do you keep worrying about some files interfering?
Do you experience some problem?

If there's no problem, then also no reason to worry about.

Ok thanks for helping sorry if I was annoying.