Server 2008 R2 brings us a world of annoyance with MOSS 2007.  It goes beyond just installing SharePoint 2007 on R2, there are many other issues that arise after the install.

So, short of just going backwards and loading Server 2008 SP2, here is a link to help you create a slip streamed MOSS SP2 install and to tackle the more annoying issues that arise just after an install.