Changing an install directory

Hello, I have been trying to move my wordpress installation from a sub-directory to the root folder.
I have copied all the files to root and gone into phpmyadmin and changed the url to point to my root directory.
I have all sorts of problems ranging from time-outs,page redirects to my forum, style sheets not showing etc.
I have done a search but cant find any posts that explain how to change directories correctly. I also cant find any config files that have basic installation information to edit.
If someone could point me in the right direction, would be appreciated.

Chuck ??