Hi DaveMC1969 and welcome,
The InfoPath Form Services shipped as a standalone install in 2007 but that product was discontinued. Today, the best way to submit InfoPath forms in a Web App is to use SharePoint which comes with an InfoPath Web Part that allows you to create very rich SharePoint web apps that leverage InfoPath and it's wonderful support for XML.
There are other vendors (including Qdabra Software, sponsor of this forum) that provide SharePoint-less solutions to submit forms from the Web. In fact, Qdabra Software has a web-based alternative to this called FormsBoard, but while submitting data from browser based forms is supported for simple forms, it is currently targeted at users who have InfoPath rich client. There are other vendors out there selling tools to submit InfoPath forms via non-ShP web frontends, but they are nowhere near as good as SharePoint at doing this. Even SharePoint's InfoPath Form Services has limitations, though.
Sorry I couldn't be more helpful. Please contact me if you'd like to see a demo of FormsBoard.