I found this solution, quoted below, link to original post here: http://steamcommunity.com/app/108710/discussions/0/864977025688898181/

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When I try and run the game i get a error saying could not process hlsl shader -na

I found that I needed to do the following to fix it:
In the steam folder for the game steamapps\common\alan wake\third party\directx\
there are two files you need to extract to folders on your desktop.
1 aug2009_d3dcompiler_42_x86.cab
2 jun2010_d3dcompiler_43_x86.cab

once you have both of those extracted into folders go inside each and copy the .dll file called d3dcompiler_42.dll and d3dcompiler_43.dll into the game directory for alan wake (steamapps\common\alan wake\)

once you have those two files in the game folder it should load with out the error.

this also works for american nightmare. and the files must be copied from archive locations and not from the windows\system32 folder those wont work.

i hope this helps as it fixed the game for me and i felt like sharing.

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Since this is the GOG version, not the steam versions, you'd just want to do a file search for those cab files or possibly the dll files you're supposed to extract from those (although they say the versions in the system32 folder won't work).

Failing that, I'd probably make sure I had the following installed:
directx9c redistributable
Visual C++ redistributable, versions: 2005, 2008, 2010, 2013
dotNet versions: 3, 3.5, and 4.0 (redistributable versions)

and of course do a reboot.


I've played through the whole game and I'm using Windows XP too. I have all that stuff installed. I only use redistributable stuff from Microsoft. I hate having to always wait for stuff to download.