When you publish an application using VS 2005 Beta 1 for ClickOnce, the publish process goes just fine. However, attempts to deploy application by double-clicking the deployment manifest fail, by giving an error that talks about a missing provider information.
This happens since VS picks up the Publisher automatically from the HKLM\Software\Microsoft\Windows NT\CurrentVersion registry key's RegisteredOrganization string value. If this value is empty string, VS still goes ahead with the publishing process. Thus, the error comes since a value is required for this field.
Hence, ensure that RegisteredOrganization has a value set in the registry.