404 Error

Sorry for not knowing what to call my problem so my topic is a bit obscure.
I have 3 wp installations, each in a directory under my primary domain. 2 of these have sub domains assigned and subsequently they also have thier own add-on domains directing to these directories. Ok so when I try to access the directory ie: mariahswind.com/crochet or mariahswind.com/oraidacrochet I get a 404 error. I know this has something to do with the sub domain or the add on domain because my 3rd installation is fine.