What are you trying to achieve by interacting with this flash website, are you trying to sign up, fill in a form?
Have you considered automating this at the network layer instead of the application layer?
Yes, it's basically signing up.
The process looks something like this:
Goto website -> Click register -> Fill out username, password 2x, email, click terms, enter captcha -> Click register -> Fill another input and select an item from a combobox -> click button -> wait for listbox -> scrape content from listbox -> click an item on listbox -> click a couple more buttons
Would this be possible to do with webrequest post/get?