Found a fix for me on Windows 8 RTM (x64).
I have an xbox 360 wireless adapter and could not get the game to launch at all, even after unplugging it, changing compatibility mode to XP SP3, run as Administrator, etc.
Here's what worked for me as I found a clue for this in another thread on this forum (
http://www.telltalegames.com/forums/...t=29796&page=2)
Anyway, here's what I did:
Download DINPUT8.DLL from here -
http://www.dlldump.com/download-dll-.../download.html
Put this file in your Walking Dead installation dir (C:\Program Files (x86)\Steam\steamapps\common\The Walking Dead)
Play
I went back and turned off all the 'run as admin', XP SP3 compatibility mode, etc and it still ran fine.
I hope this also fixes controller support so I can run this from the Big Picture interface on steam, haven't tested that yet.