Actually, the latest Mac vs. PC add, the one with PC divvying up money between "advertising" and "fix Vista" realistically demonstrates how Microsoft approaches problems.
Microsoft has generally considered stability and security problems to be marketing problems rather than engineering problems.
While security is a "big picture" thing with a myriad of small things that need to be adequately addressed in order for there to be any security at all, first you have to admit that there is even a "picture" to begin with.
Historically, Microsoft has denied that there were any serious design or implementation problems with Windows at all.
Once, while being interviewed by a German magazine, Bill Gates famously showed his contempt toward users of his software by stating that "There are no significant bugs in our released software that any significant number of users want fixed."
He also said that Microsoft's software isn't the problem, it's you stupid users.
Gates: "It turns out Luddites don't know how to use software properly, so you should look into that."
Your faith in the veracity of TV advertisments is disturbing.