Recently Started Steam on my gaming machine and was greeted by a “Fatal Error: Failed to load Platform Modules”. I first checked out Steam’s official issue page regarding the issue: http://supportwiki.steampowered.com/wiki/Steam_Error:_Fatal_Error:_Failed_to_load_platform_modules but didn’t seem like much help because the registry entry they requested changing was already correct. After a little searching around I found that all that was needed was to remove “Steam.dll” in C:\Program Files\Steam”. Removal of this file forced Steam to update on next startup. This resolved any issues I was having. Hopefully this is helpful for others having the issue.