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: 
`[HKEY_CURRENT_USER\Software\INTEL\DISPLAY\IGFXCUI\HotKeys]
"Enable"=dword:00000000`

Setting this registry key will do what you want.
Steps
1-Move the mouse to the screen & right click (you will see View, Sort by, Refresh, Graphics Properties...point to Graphics Options & Select Hot Keys.
2-Select Disable.
3-Now if you try to press [Ctrl] [Alt] + Arrow Keys the video screen wont rotate any more. For some reason you want to control screen rotation just Enable it again.