I was having this exact same CTD problem (Win7 64 Bit, FSX with ORBX FTX & Traffic but otherwise a clean install) during "Flight Reset" or "Exit". Not during "End Flight".
Installing a third party app really didn't make sense to me as the issue sounds more like a code shutdown sequence or timing issue and all a third-party app. may possibly do is change that sequence or timing subtly (thus masking the true problem).
Following up on some clues in this post (http://www.enigmasim.com/forums/index.php?showtopic=1065) I tried just one single change on my system and the problem went away:
In the advanced properties tab for my preferred sound playback device I set the "Default Format" for audio playback to 44100Hz (to match the PMDG sound files).
I left the "Default Format" as 24 bit and both check boxes in the "Exclusive Mode" settings checked.
This single change cured the problem for me during application exit or flight reset.