Microsoft's Software is Malware
Other examples of proprietary
Malware means software designed to function in ways that
mistreat or harm the user. (This does not include accidental errors.)
This page explains how Microsoft software is malware.
Malware and nonfree software are two different issues. The difference
between free software and
nonfree software is in
whether the users have control of the program or vice versa. It's
not directly a question of what the program does when it
runs. However, in practice nonfree software is often malware,
because the developer's awareness that the users would be powerless to fix
any malicious functionalities tempts the developer to impose some.
As this page shows, if you do want to clean your computer of malware,
the first software to delete is Windows.