In the project properties, you might check which browser is selected.
You can force one of the predefined browser options (Preview is supposed to launch a browser. If it doesn't, there's a browser issue, try another one).
Be sure that your computer/system/browsers match the system requirements
Sometime users might need to configure their ports like in this topic
Let us know if you still can't run C2.
EDIT: ha it appears I was a bit slow to write my post.
Glad you're set. Enjoy C2 Kyatric2012-01-13 17:40:53