Intel HD 4000 graphics isn't showing in device manager

Hello, this is my first post.

So I am using Toshiba Satellite L855-12N laptop (http://www.toshiba.co.il/en/discontinued-products/satel...). My problem is that AMD Radeon 7670M graphic card is dying, display at random times starts to flicker and then restarts the computer. So I checked that laptops Intel Core i5-3210M should have built-in Intel HD 4000 graphics. And so my plan was to disable AMD display driver and use Intel HD 4000.

But the problem is that in device manager there is no Intel graphics if I disable AMD driver computer use VGA standard graphics adapter driver (which only provides 1024x768 and 800x600 resolution).

If I download intel driver and try to install it but I got an error - ''This operating system is not supported''

In some forums, I read that Windows 10 only shows main graphics card in the device manager and through BIOS I can change which graphics card to use. In my case, in BIOS I didn't find this option. So I made a clean install to windows 7 home premium 64bit and updated it. Nothing changed still in device manager I only see VGA standard graphics adapter I have try to manually install Intel HD 4000 driver on VGA graphics but it didn't work and when I install AMD Radeon HD 7670M driver it replace VGA graphics.

I don't know what to do I have tried all Intel HD 4000 graphics drivers which I could find (including from Toshiba site). And if I install ''Intel driver and support assistant'' at graphics it shows Standard VGA Graphics Adapter before I install Radeon driver and after it shows just Radeon HD 7670.

Maybe my laptops i5-3210M is different and does not include Intel HD 4000 graphics.