“Better” Microsoft commercials?

A few days ago I posted about the un-funny Bill Gates + Jerry Seinfeld commercials.

Now they’ve released a new set of commercials that do promote Windows, and they are a bit more effective.

The only thing I’m confused about is: if Windows is the product that is being promoted (as one can tell from the logo shown at the end of each commercial) why are they promoting “PC’s” as opposed to Windows? I can understand why Apple would promote the Mac over the PC (as they produce hardware & software and it’s the combination that is being marketed), but not why Microsoft is using the term PC, which is not a Microsoft product nor a Microsoft innovation. Perhaps it’s just because Microsoft doesn’t perceive Linux and other PC operating systems as a threat.