I have the same issue (- i.e. Arma2 "has stopped working" in the tick box section, 2 ticks from completion). It always happens when launching the release 1.62 arma2oa.exe (version 220.127.116.11).
It didn't happen before the 1.62 patch. The beta versions work fine, so I use them for launching arma2 since the release of 1.62. This issue is not an isolated user's crash.
This bug is pretty severe and needs fixing (- even though it is possible to work around by launching the beta version instead). I have the non-steam version of Arma2 by the way.
OS: Windows 7 Pro 64-bit.
Link to my crash files: http://dl.dropbox.com/u/22948126/ArmA%202%20OA.rar