Problem installing Flash Media Server 3.5.1

I'm looking for some direction in correcting this error.  I am trying to install FMS 3.5.1 onto a Windows 2003 Server system and I'm getting this error message, "Setup has detected and invalid registry entry and is unable to proceed.  This can be corrected by uninstalling the current version using the Windows Control Panel, the restarting the installer."

I have probably created this situation as I had originally installed FMS and in my utimate wisdom was going to manually move it from the install directory to a different one.  It didn't move completely as one of the files was being used and instead of undoing the move I rebooted then decided to uninstall the application.  I got the "Application was uninstalled successfully although some files could not be deleted" dialog.

Now, when I try to reinstall the application I get for aforementioned error.  Obviously something in my registry but I'm unable to locate what I may need to remove.  I also noticed that Flash Media Administration Server and Flash Media Server are still present in Services, although they are not running...

Thanks for any help.

Robert