Are you using one of the predefined application presets? or creating your own?
Are you having the wizard create the table for you? Or using your own table.
If using your own table, please include a SQL dump of the structure.
usually when the Data Assist wizard crashes it is due to memory leak in Dreamweaver. Here are some things I Recommend:
1) Turn of Preview - go to WebAssist -> Preferences. In the preview section, select the Disable preview option
2) before running the wizard, close the Files and Server Behaviors panels
3) If you have an Anti Virus program installed that scans files on creation, disable it before running the wizard.
4) Delete the Dreamweaver Cache file from the users configuration folder:
Then restart the computer before starting the wizard, IF you can disable any background services, that would help too.