I'm not sure how you expected MS to prevent BSOD, which often derived from behavior of programs or drivers. The worst BSOD timeframe seemed to predate computer resources being so vast that common OS protections were viable. And when programs were more hard-crash prone in general.
Yet the echos of a bazillion BSODs that have seemed less prevalent with Chrome are there.
To your point, comparing an OS to a browser is lame.