DMHKey.exe
(Diamond Multimedia)
Diamond Hotkey handler module of the Diamond Multimedia InControl tools that get installed when you install the drivers for some of the Diamond Stealth graphics cards. The InControl Tools enable you, amongst other things, to define keyboard hotkeys as quick shortcuts to applications. DMHKEY is the background task which makes this possible.
Recommendation :
If you do not use any of the user programmable keys feature of the InControl Tools, disable DMHKEY with Startup Manager as it is sometimes known to clash with certain applications and cause Illegal Operation crashes.