Uninstaller should remove stray items from registry, and Active Directory.
The uninstaller removes items from the registry, but not all items from active
The downside is that users in the domain will still think they can auto-enroll,
even when the proxy is uninstalled.
The workaround is to manually remove 2 entries with LDP. I will need to document
Bug already CLOSED/VERIFIED. setting screened+ flag