I will just like to ask some questions that will help ing giving a good answer.
Which browser are you using, have you tried to clear the cache.
Have you worked with any other jboss before this one you are talking about, it could be that that one resides somewhere.
If you answer yes to both questions above, i will suggest you delete and re-download jboss and try to restart your system.
Hope these gets u somewhere.
In JBoss AS 7.0.1 (I think) we used to persist the deployment information into the JBOSS_HOME/standalone/standalone.xml. If you open it, you'll probably find a deployment section with your deployment name in it. Removing that entire deployment section and saving the file and restarting the server will get you past this.
This has been fixed in later releases. So you can upgrade to 7.0.2 or 7.1.0.Beta1