Thank you for your post.
FileMaker Server 9 was neither tested nor certified with Windows Server 2008 (nor IIS 7). However, it may still work.
Try replacing the server address with the IP Address. That is:
Any other information you can provide may be helpful.
Tried that too with the same issue. The Filemaker banner and logo is being displayed but the Username and password fields are not. Though it might be the Java version (run-time version 5 comes with FMS9Adv) and the IIS7 compatibility, so i tried to update to the most recent version of Java runtime and it made the issue worse, not i can't even run the admin console.
So i am just going to copy the existing server (Windows Server 2003) to the VMWare and down the road when we plan on upgrading to the latest version of Filemaker Server, I will switch it to Windows2008 server