Hello and welcome to the forum. Check a couple more places.
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
And
C:\Users\YourUserName\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
and failing either or both of those look to these registry locations but of course back it up, create a restore point manually, and export the key prior to editing for safe keeping.
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run