After you installed SharePoint 2007 or WSS 3.0, you might face some problems regarding the installation account,specially if you change the username/password of the installation account.
as per MS best practices,its recommended to specify a new account for the sharePoint installation perior to install SharePoint 2007 and don't use your domain account in the installation.
this post is to show you,incase you install MOSS with your account or with any other domain account and you want to change it,simply read the below KB how to do it ?
its really a helpful article and to the point,specially if you create the batch file which is metioned in the article to do all of that in one step :).
Happy MOSS times :).