I see. A full dump of all memory (one of three options) would contain data from
the active programs at the time of failure - - so yes, there is an exposure.
The other dump option is the terse 64k version, which is merely a 'stack trace'
showing which functions of the program call which others up to the point of failure - -
no program data is captured.
(right-click My Computer->Properties->Startup & Recovery Tab; select 64k for write debugging information)
The last option is to NOT create dumps at all.
%SystemRoot%\Minidump is the typical location for saving dumps.
You should peek at this and see just how many you have lying about.
A good system should not dump at all (duh!) but you should try to find out
why failures are occuring and seek solutions.