Help! I broke my WordPress installation, too.

I have a similar problem as Shepard Jim's Mar 11, 09 post. I changed WordPress address url at settings/general to bestfriends-animalclinic.com/home/. I added /home/. Now I can't get in wp-admin, view the WP site, or anything. The site is still there, but formating is messed up--all squeezed narrow and no header image. I've done this mistake once and re-installed WP and re-uploaded Atahualupa theme folder and re-build a lot of pages. And did this mistake again. I don't understand any of the exchanges between you and Shepard Jim's posts. Is there any way you can help me, Flynn? Or do I have to start from scratch re-installing WordPress and Atahualupa theme all over again? Thanks.