There is no need to disable anything, only ignore it and order it to ignore. Beta drivers/installers are not signed to death by Microsoft, this is why they are "untrusted". You know, if you need "trusted" software only, install windows 8.x and install no other software but what windows update and the windows store offers. Then you'll be safely in the hands of the NSA and no one else.
This rant is not directed against you, but against your over-paranoid security software. I suggest getting rid of it. You even pay for being annoyed. Learning computer basics and how to be careful is easier and also more entertaining.
CPU: AMD Phenom II X4 810 @ 3120MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 835/1135MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 3.11 Pro x64