# search on folders
C:\Users\USERNAME\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup
# Or open by shell commands, Win+R
shell:startup # user configures
shell:common startup # system configures
# regedit key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
# services.msc
# turn them off by setting startup type to 'manual'
# ultimately solution by using script
Get-Process -Name process-name* | Stop-Process
Get-Service -DisplayName service-name* | Set-Service -StartupType Manual
# Stop-Service