Cannot remove "Browse with IrfanView" context menu

[lpv]

Hey I've been using this program since Win7, I suppose I found it better than the others and had no reason the change since(first post here is why I'm saying that ), now I have a little problem.
As in the title, I untick the check box "Add Browse with IrfanView for Drives and Folders to shell menu" but it comes back immediately, any idea?

[Bhikkhu Pesala]

Run IrfanView as an Administrator.

[Bhikkhu Pesala]

In my case, the option was checked, but when I tried to use "Browse with IrfanView" from the Shell menu, the application was not found. Guessing that and older version of IrfanView had been removed, I ran IrfanView 4.58 as Administrator, cleared the checkbox, and the menu item disappeared. I then re-enabled it, and the Shell menu item now finds IrfanView OK.