Check Task Manager → Startup apps and disable anything named Process Monitor, Procmon, or Sysinternals. Also check these locations for a Procmon shortcut:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup
If it isn't there, check Task Scheduler. Run taskschd.msc
Look under Task Scheduler Library and search for anything referencing Procmon64.exe or Process Monitor. Disable/delete that task if you find one.
Also check the Run registry keys. From an elevated Command Prompt:
reg query "HKCU\Software\Microsoft\Windows\CurrentVersion\Run"
reg query "HKLM\Software\Microsoft\Windows\CurrentVersion\Run"
reg query "HKLM\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run"
If one of those contains Procmon64.exe, remove that specific value by using Registry Editor (regedit)
You can also search the file system for Procmon64.exe and then inspect where it is located. In File Explorer, select This PC and search for Procmon64.exe - you can also use an elevated Command Prompt with where /r C:\ Procmon64.exe. Once you find it, right-click the file and check Properties → Digital Signatures or Details to confirm it is the Sysinternals Process Monitor. If you no longer need it, you can terminate Procmon64.exe first and then delete the executable.
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hth
Marcin