Error 404-not found appears when I try to create a post to my blog. New install


I've installed wpmu several times and never encountered this. I installed wpmu on my godaddy server. I have another wpmu site on the server already that works fine. When I installed the new wpmu site, everything works fine until I post on my blog. When I try create the post then click visit site I get error 404-not found. I called godaddy, checked the database, reinstalled wpmu 3 times and nothing works. I should mention that the other wpmu site is of the same server with the same name in a sub-folder. The one I having a problem with I'm trying to install on the root. Can anyone assist?