skozmin, I am glad you were able to get it working.
Once you have installed a discrete graphics card in a desktop system the integrated graphics become disabled by default, hence the errors you got from Intel® HD Graphics driver and Intel® WiDi software.
If you want to get Intel® WiDi working with the third party graphics card (and I cannot guarantee it but) you will need to setup your BIOS to allow both graphics controllers to work at the same time, if possible set it up for Intel® HD Graphics (integrated GPU) to be the main or primary graphics adapter.