Windows 10: Windows Defender Antivirus Causes 100% CPU Usage at Random Times

I'm having horrible problems with Windows Defender antivirus. At random times it will start to consume 100% CPU usage and make my computer unusable for 5-10 minutes at a time. I am unable to kill the process as admin and I get no notifications as to what it's scanning, why, or when it will end.


There were two mechanisms I could use to cause the issue on-command. First, restarting my Corsair audio drivers service; second, sometimes when I start a video game that requires BattlEye, it will also hang but this is less reliable.


What I've tried:

1. Disabling Windows Real-Time protection temporarily via the Windows Security panel and "permanently" via various Registry edits suggested here and elsewhere. When it is disabled the problems disappear, but there is no permanent way to turn it off - Windows always turns it back on regardless of what I do to the registry.

2. Disabling Windows Real-Time protection by installing an alternative Antivirus product. I installed Panda Dome and disabled the Windows Real-Time protection, and this resolved the Corsair service restart. It didnot fix the BattlEye issue - Windows Protection still was consuming 100% and locking up my system even when it's supposed to be off.

3. Excluding all relevant services, folders, and executables from Windows Real-Time Protection. I did this, and it affected nothing everything still locked up.

4. Modifying Affinity and Priority values of the MsMpEng.exe service - I was unable to do this because Windows tells me "Access Denied" again, I am the administrator on the system.


This is beginning to become extremely frustrating - why can't I configure windows to operate the way I want? Forcing me to have a broken antivirus is an awful design decision and something that should be well-within the control of the owner of the product. Regardless, I'd really just like a solution that doesn't turn my CPU into a toaster whenever Windows decides to "protect" me. It's worth mentioning that I have friends who also are on Windows 10 and using the same software as me and encountering no CPU usage issues.


How can I disable Windows Real-Time protection permanently? Failing that, how can I get it to not consume 100% CPU usage on various scans that it deems necessary?


Windows 10 Home Version 1903 OS Build 18362.778

:)

 

Anniversary Update: Windows 10 CPU usage 100% All the time


So I disabled Defender and search indexing completely.

I did a clean boot minus TeamViewer because I have to use it to access my PC for now.









Cortana is acting normally.

Edit: here are a list of the details by CPU usage with Chrome open.

 

Windows 10 Defender Full Virus Scan- CPU Usage 100%

High CPU usage has been encountered before: this thread (older) refers to dealing with a corrupt database file, but it's a bit long.
High CPU usage from Windows Defender

There are other such threads if you search for (e.g.)
Defender high cpu usage





In the past, sometimes it's proved necessary to exclude a folder:
High CPU usage from Windows Defender
(same thread)

 

CPU usage 100%





As you can see my CPU usage is always 100%, Due to this CPU fan never stops, even when temperature are normal.

When I turn on pc, it always starts with 100% cpu usage. I also ran malware and antivirus scans, couldn't help (Quick Heal antivirus).

Using Windows 10 updated to latest version.