I have looked at trying to rollback my DirectX to 9.0c from the current DirectX 11 on my machine now (I think the version was part of one of the Windows automatic updates). However, it does not appear to be possible for someone with my limited technical ability to get rid of DirectX 11 in favor of an older version.
You do not have to rollback. Version 9 and 11 can co-exist fine. Just install 9 as well, because the game will not work without it.
Do you get any other symptoms you could tell me about around the crash? Freezes, color changes, resolution changes, error message?