Freeware is not open-source. Freeware refers to a program that is free of cost, but the source code is kept secret.
Microsoft Windows, Office, and other big name software such as Adobe Reader are proprietary software. Google Chrome is proprietary software, while Chromium is open-source.
Proprietary software is often referred to as closed-source. For more information, see http://en.wikipedia.org/wiki/Proprietary_software.