Googling IRON BROWSER "CLASS NOT REGISTERED" gives some hits.
https://code.google.com/p/chromium/issues/detail?id=171355 seems relevant (it's a link in the first hit). It says it's a known bug. Just wait till it's resolved. In the mean time, if you prefer, use another browser.
Hello! Can you tell me how can i fix iron error: "Class not registered", in windows 8 64 bit! I mention that the error appears when i launch iron from the shortcut taskbar (when i press mouse left click); when i press right click - new iron window, everything is working just fine! What should i do?