Fault Module Name: wrap_oal.dll
This indicate that it's NOT Couatl that has crashes, but it's the wrap_oal.dll module that has caused Couatl to crash.
The wrap_oal.dll it's a sound library from Creative that is used to support OpenAL, and it interfaces with your audio drivers. It's likely either the Windows 8 audio driver is not compatible with it.
Try this OpenAl download from Creative:
http://connect.creativelabs.com/openal/Downloads/oalinst.zipBut I don't have any idea if it can be used with Windows 8, right now you should considered Windows 8 to be used "at your own risk" for FSDT products, we'll eventually support it officially in the future, but is still a bit early for it.
If still doesn't work, try to DELETE the wrap_oal.dll file in the FSX\fsdreamteam\Couatl folder, so the one downloaded from Creative will take precedence. And, try running FSX "As Administrator"