Oracle Application Server problem

I made a error when I first install OAS on a NT box (Oops). There was a dialog box asking for TCP/IP domain name during install, which I entered as hostname. When I terminated the install process and restarted it, it wouldn't ask that question ever again. Even when I blew away every directory for the aborted install, this question still wouldn't show up at the next install. So I went along with it, only to find that some aspects of OAS wouldn't function. For example, when I tried to access the server configuration of the listener through OAS manager, I got a message saying "can't locate the server hostname.hostname:port", which clearly is a consequence of my early error.
Does anyone know how I can correct the domain name error? Thanks!

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