This was the first time I used BlueScreenViewer - yes, it does seem useful. (Sadly)
The Keyspan USB to serial adapter is widely recommended, but I replaced mine with an old Edgeport USB to 4 serial port adapter and no more BSODs - so far. I also have a Startech USB to 4-serial adapter but haven't tried it yet.
It appears that others have had this problem: a search for "BSOD Keyspan" pulls up many hits.
I'm sticking with Win 7 until ........?
Jim Sgt