Most blue screen of death problems arose due to bad device driver problems and were not actually Microsoft generated problems. Microsoft however got the blame from disgruntled users. Over the years Microsoft have made massive changes to the operating system starting with HAL (a Hardware Abstraction layer) and changes to the Graphics Device Interface (GDI). Then after the Windows Error Reporting system was introduced with XP, and Microsoft launched s test programmes and used lessons learned into subsequent versions of Windows, things got a whole lot better. Barring genuine hardware failures, most blue screens have become a thing of the past.Most Windows installations now just automatically reboot at a blue screen class error, so if you have had an unexpected reboot of Windows, you may have had a blue screen.