Hi mgergolet,
When you are trying to set the connection, is your system getting to the point where the TV is being recognized under Devices> Project? Have you tried update the graphics driver and WiDi adapter firmware?
Posting your dxdiag report here will be very helpful but try to added as an attachment.
Please try running all windows updates. Also, you can try updating the BIOS of your computer and uninstall the current graphics driver and install the following:
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23985&lang=eng&ProdId=3720
If you find problems installing the driver, try the steps mentioned here:
https://communities.intel.com/docs/DOC-22542
Kevin M