3 steps for a higher registration rate

[symptome]

I've got a google analytics funnel for registration and the sum of leaving people during the registration process is horrible.

Is it possible ... (and how)

- to skip the first message box with the forum rules and include it in the main-registration-window?

- to hide the registers in the header (where the links for forum, chat and wiki reside) so that there are no other links to exit the registration process (except closing the window or back button)

- to skip all the other information except User-Name, Password and Email, so that they user first hast to committ the link in the mail and then fill out the rest of the profile?

Thanks!
Marcel