changing template pages

Hi again
still having layout problems. The best example of how i want my registration page and blogs page to look like is in the website Edublogs which is built on the wordpress format. At present as well as having my website theme and multisite installed I have buddypress/templates too so my blogs page and registration page is aligned properly and looks ok. I need to deactivate buddypress as it conflicts with a lot of multisite plugins but when I do it messes up the layout of my blogs and regsitration page.
what i need to be able to do is deactivate buddypress and create a blogs layout page and registratio page like the wordpress built site Edublogs. is their a plugin that may help or template. many thanks