Question: I'd like to disable `ctrl`+`alt`+arrow keys changing the screen orientation. I've seen [here](https://superuser.com/questions/279756/how-to-disable-the-screen-orientation-hotkeys-in-windows-xp) that this is a function of the Intel graphics driver. So I followed the directions and `disabled hotkeys` in the `Intel graphics card control panel`, but the hotkeys are still `enabled`. Might there be some other program controlling this? I'm running a Lenovo T420.

Answer: 
Still using Windows 7 on a machine with Intel graphic card. The problem I had is very similar to the one described by OP.

Even after disabling the hotkeys in Intel Graphic's control panel, they are still intercepted by a small process called, on my system, `igfxHK.exe` (I assume the name could stand for "Intel Graphics HotKey").

After I killed it, the hotkeys were readily available again.

It is not clear how that process is started up during logon. I searched with AutoRuns all the standard locations, but there's no specific entry. Most probably it is run indirectly by the driver or the control panel applet.

So after you kill it it will be reloaded after a logon. The nice fact is that the Intel Graphic control panel **will not** load it again if you open the panel. Even if you try to activate Intel's hotkeys (they won't work any longer, even if activated in the panel).

So the solution is temporary but as long as you don't restart the machine or log-in again, it won't bugger you again.
This following powershell command worked for me:

```
reg add "HKEY_CURRENT_USER\Software\INTEL\DISPLAY\IGFXCUI\HotKeys" /v "Enable" /t REG_DWORD /d 0 /f `

```