graphics Switchable Graphics Update Problem

[BoomyBoy]

Hello everybody. I have Dell Inspiron computer with ATI Radeon HD 7750M which is switchable with Intel HD 4000. I tried to update my ATI graphics today but however it said that my VGA number was not compatible with the driver and told me to contact the manufacturer. I'm 100% sure that I have ATI Radeon HD 7750M. What could be the problem?

[Xahid]

Disable the Intel 4000 from Bios, & Run the Ati auto-detect utility.

[BoomyBoy]

I couldn't find any way to disable it. There's no option in BIOS to disable it:(