Antimalware service executable eats memory

title. it's always taking 200-300 mb of memory.

I tried:

disable windows security, got hit with this setting is managed by your (non existent) administrator

end task, got access is denies

command prompt things, did nothing

edit group policy, did nothing

enable disableantispyware in regedit, got hit with access is denied

tried to give myself permission to enable disableantispyware, access is denied

in case I missed any, I basically tried everything you can find online. no matter what I do, either nothing happens, access is denied or this setting is managed by your administrator

I'm about to flip this is my computer, I should get to choose what to do. I am the administrator and only user