Is there a Windows 3.5?
There used to be Windows 3 and Windows 3.1. I don't remember a 3.5, though.
www.webopedia.com
I searched here, and this is one of the results:
blue screen of death
Abbreviated BSOD, an error that can appear on computers running in a Windows environment. This includes even the earliest versions of Windows, such as Windows 3.0 and 3.1, and still occurs in later versions such as Microsoft Windows 95, Windows 98, Windows NT, and Windows 2000.
http://www.webopedia.com/TERM/B/blue_screen_of_death.html