For the technically inclined, you can run Steam directly from a terminal or command prompt. This provides a live log of everything Steam is doing in the background.
Go to the (or Local Files) tab and click Verify integrity of game files . fatal error failed to initialize steam resident evil 6 upd
: Completely exit Steam via the system tray. Right-click your Steam desktop shortcut or the Steam.exe file in your installation folder and select Run as administrator . For the technically inclined, you can run Steam