On vista it seems to be called KSOD but the difference seems to be that one can start taskmanager with a ctl-alt-del on nearly all the vista reports.
I have seen several types of hangs where explorer fails to start that allow taskmanager to start and locate evt view hangs, dot net failed installs and hanging automatic updates.
The one I now automatically associate with unidentified rootkits, trojans or AV deletes, does not allow any method to get a taskmanager or boot into safemode w/command prompt.
If the number of reports are falling off, I would assume the rootkit writers have changed what would develop into a "telltale" before I would attribute it to something Microsoft fixed.
I am still using the "nuclear option" until something better comes along.