Hi Joe. I have the same problem as mekabbar. I have a 4.0.18.0 widi driver installed on Windows 8.1 but is not working very good. I tried to install the 4.2.21.0 driver, but i have the same error message as mekabbar.
I tried to install the intel display driver 15.33.5.64.3316 from your link, but no success. I was become an error message:
thedriver you want to installhas not beentestedfor thiscomputer.Obtain theappropriatedriver from thecomputer manufacturer.The installerwill now exit. I have ASUS K95VJ laptop. I was downloaded this driver from ASUS-s website, but the same error message.