Are you using an Application or design Preset? If so which one?
Do you have a Database connection defined and tested before starting the wizard?
Are you using your own database table, or one of the tables created by the wizard?
If you are using your own table can you provide a dump of the database structure so i can try to recreate the problem?
Some things to try:
Restart the computer, Dreamweaver can sometimes consume memory and not put it back. If it has been running for a while, it can get to a state where there is limited free memory.
Close the Files panel and Server Behaviors panel before starting the Create pages wizard.
Disable the preview. Go to WebAssist -> Preferences. In the preview section set the option to disable the preview.
after setting one of the pages and clicking the ok button, wait a few for the UI to stop processing before making the next selection.