Happy to hear that you resolved the issue.

Installing directx 9 worked for me as well. Thanks for the help!

This Solution worked for me on Windows 7 x64:

Download this DirectX9-Web-Installer from Microsoft:
http://www.microsoft.com/download/en/details.aspx?id=35

Run the downloaded Exe-File with Administrator-privileges.

The installer will download only missing DirectX9-DLLs on Windows XP, Vista and 7.

I would not recommend downloading DirectX-components from other sites.
Use the official Microsoft-Sources...

Why did this error happened?
Vista and Win 7 coming with DirectX10/11 out of the box. If a game is compiled against DirectX9 like Grimrock, some DirectX9-Components are missing.

Yes I ditto this, thanks guys for all your help. I'm off to delve in some dungeons XD .

Installed dx9 and it fixed it, IT IS ON!!!!

yep direct x update downoad from microsoft sorted it :D

See ya time to play

Cheers for the info.

Okay, I thought perhaps this might be related to my own problem, but its not resolving my issue and I hope someone might be able to help me (being clueless with these things). Whenever I attempt to get Grimrock up and running I receive the error message:

D3DError - CreateDevice failed: D3DERR_INVALIDCALL

Drives are updated and all that jazz, so, I'm kinda stumped.

Its seems DirectX can't create the full-screen(resolution?).
Try this:
Open the file:
C:\Users\<your username>\Documents\Almost Human\Legend of Grimrock\grimrock.cfg

Set the following entries to this:
displayMode = 0
resolution = "1024 x 768"

displaymode=0 runs the game in a window and "resolution"-entry starts the game in a lower resolution. Lets see if DirectX can initialize the screen then.

Yeah installing DX9 update worked for me also, thanks guys!

Thats interesting. Maybe the game tries to find the max resolution of your system and set it in the options at the first start, but something goes wrong in this process and DirectX can't handle this particularly resolution or refresh-rate...

This has resolved my issue, and I thank you. I would have responded sooner but real life pulled me away ;)

I dunno. My native resolution is 1920x1080 and it was set to 15XX x 526 or something (I forget). It's fine now, so I'm not too concerned. Thanks to your tip I was able to get on to playing the game, so thanks!

Downoloading and running the direct-x 9 installer didn't work for me (the installer wimps out saying I already have a later version installed). I went to apply the above fix to the cfg file and noticed that the value that was in there already was complete rubish (1707 x 960). So I changed that to something more standard and left the displayMode setting alone. Worked like a charm.

Thanks.