Windows Vista security is a joke

You might think that apple is poking fun at windows in this latest Mac advertisement, but you’d be fooling yourself.  But judging by the comments in Very Severe Hole" in Vista UAC Design, its really a documentary, not an ad.  What’s the giant security hole – oh yeah – any installer automatically runs with administrator privileges, any installer.  Did it really take Microsoft 6 years to figure this out when both Mac and Linux already work their way?  Or is this how they innovate?