Windows 7 is stable if you aren't running it on shoddy hardware. OSX has just as much a chance to lock up if those are the circumstances.
I've never had Vista x64 nor Windowx 7 x64 lock up even once on my desktop because of a Microsoft-related issue. The only issues I've run into, which were resolved fairly quickly, involved nvidia's driver support.
I've never had Vista x64 nor Windowx 7 x64 lock up even once on my desktop because of a Microsoft-related issue. The only issues I've run into, which were resolved fairly quickly, involved nvidia's driver support.