No, Windows is not a virus. Here's what viruses do:
Viruses use up valuable system resources, slowing down the system
as they do so -- okay, Windows does that.
Viruses will, from time to time, trash your hard disk -- okay,
Windows does that, too.
Viruses are usually carried, unknown to the user, along with valuable
programs and systems -- Sigh... Windows does that, too.
Viruses will occasionally make the user suspect their system is too
slow (see
)
and the user will buy new hardware -- Yup, that's with Windows,
too.
So, Windows is not a virus.