Hi
I suspect it's got nothing to do with your virtual server.
Reader Extensions installs its own version of JBoss, which is not integrated with the other installers. If you go to your NT Services, you will see two NT services:
AdobeReaderExtensions
and
JBoss for Adobe LiveCycle
You need to make sure that only one of those is running at a time, because they both use the same set of ports.
There is a document somewhere on Adobe's site for moving all the RE services into the Workflow Jboss deployment, so that everything is running in a single instance of JBoss. If you have trouble finding it, let me know, and I'll try to dig it up.
Good luck...
Howard
http://www.avoka.com