Windows is nothing but mature. Billions of hours running, automated bug reporting, millions of developers, nth generation tools.
And yet it still BSODs on me too often to be actually usable.
Windows isn't a closed hardware platform like OS X, so driver support can be difficult (Windows update helps a lot on that).
Also, are you overclocking? Using a 4-year-old motherboard? There has to be some reason for BSOD - it's not a normal condition. Not making excuses, hundreds of millions of machines run for years without doing it.
I use Linux.
Nowadays, with the experience of handling dozens of Windows machines both server and client, I can tell you with a high degree of confidence that BSODs happen only when hardware is dying or a driver is buggy. The flavors I can confirm this for go from XP SP3 to Server 2008, passing through Server 2003, Vista and 7.