Had a perfectly working machine on windows 8.1 but then I got BSOD or lock-ups once or twice a day after upgrading to windows 10. I reverted back to windows 8.1 - actually still got BSOD but only when resuming from sleep and only sometimes. So at least I can be productive without risk of a crash and losing work. The nvidia forums have plenty of people with similar issues. The latest drivers issued in the last week or so still have the issue. So you are not alone.