Repeatable crash, happens every time. Launch Elemental from Impulse and skip the intro with ESC. When the main menu shows up, press SHIFT + TAB, click on the Reactor 'Settings' button, and in the new settings window, click on the scrollbar or scroll arrows. This always results in a moment of stuttering audio followed by a CTD.
DxDiag.txt: http://pastebin.com/LDie9FpF
debug.err: http://pastebin.com/AdfuLJVE
ImpulseReactor.log: http://pastebin.com/uKQQh01e
dump: http://dl.dropbox.com/u/6030376/Elemental0_298-2010-04-10T17-26-20-578.zip