Hey there!
The "file does not exist" error is normal and everyone has it. Thanks for posting the log, the game crashes when trying to initialize your game sound. The next two lines of a working install would be:
...
[19:52:23] Engine: Loaded texture assets/ui/textures_manual/trash.dds
[19:52:23] Engine: Loaded texture assets/ui/textures_manual/copy.dds
[19:52:24] Lua: Initialising Sound Manager
[19:52:24] Lua: Initialising Music Manager
...
So let me guess... are you using a Razor headset or any headset that basically has an integrated soundcard? Any external soundcard? You could try to unplug that (headset or soundcard) and see if that "fixes" the problem.

Also, try running the game in Windows 8 compatibility mode if it then works but remains silent.
Cheers!