The main problem with Windows is that it has to be able to run on an infinate combination of hardware environments. Third party drivers are what makes Windows poor in comparison to OS/X.
I'd like to see Microsoft to do a hookup with a premium PC manufacturer and do a version of windows where all the drivers are written in-house and everything is designed to work with each other. You could ditch so much of the crap in Windows if you could specify a smaller hardware set.
It's be interesting to see just how good Windows was when put in a similar situation to that with OS/X enjoys by default because it's designed to work specifically with that hardware.
That's an excellent point that most Mac lovers choose to ignore. You can see how stable windows can be if you run it on a Mac. Apple use high quality stable components in their computers and so windows run's very stable on these machines. As good as or better than OSX.