Thanks for confirming that
Can you please try the following-
On the drive on which you have installed PSE,on my machine it is on C:
Go to C:\Program Files\Adobe\Photoshop Elements 9\Locales\<locale>\Plug-Ins\Import-Exportand you will find twain plug-in. Remove that plug-in from that location and copy it somewhere else.
Now launch PSE and check if it works.
Can you please confirm if the issue is resolved or not?
I see about 3 threads regarding this crash, in one of the threads you have mentioned that it is working fine.
So would like to know the scenario in which crash is actually happening...?