Hi,
I have two suggestions:
First one: add your account to admin group temporarilly, then disable the option. after that, remove it from admin group again.
Second one, in your standard use account, when you click "disable " button, if it would prompt a dialog and let you use admin account to finish this operation? If so, type your admin user account name and password, after that, you can disable it.
Let me clear this up:
task manager is showing different startup items for different users... how come?
It is because there are items that start exclusively for certain users while others start for all users.
The items which start only in your profile MAY be deactivated by you, no matter what permissions you have.
So if you may not deactivate one item as a standard user, it implies that it is a startup item for all users! And those can only be deactivated by admins.
Now you report, that the admin does not even see that item - this cannot be.
I am writing this, because the "solution" is illogical. No one would need to temporarily promote users to solve this problem.