NPS fails to install

I am trying to reinstall Network Policy Server, but each time I receive the following error message (Event ID:1016- Source:Service Manager), which reads as follows:
"Terminal Services: Installation failed
 <Error>: Attempt to install TS Gateway failed with error code 0x80070643. Fatal error during installation
 The following role services were not installed:
 TS Gateway
Network Policy and Access Services: Installation failed
 <Error>: Attempt to install Network Policy Server failed with error code 0x80070643. Fatal error during installation
 <Error>: Attempt to install Remote Access Service failed with error code 0x80070643. Fatal error during installation
 <Error>: Attempt to install Routing failed with error code 0x80070643. Fatal error during installation
 <Error>: Attempt to install Health Registration Authority failed with error code 0x80070643. Fatal error during installation
 <Error>: Attempt to install Host Credential Authorization Protocol failed with error code 0x80070643. Fatal error during installation
The following role services were not installed:
Network Policy Server
 Routing and Remote Access Services
 Remote Access Service
 Routing
 Health Registration Authority
 Host Credential Authorization Protocol "

Incidentally, I also noted after running SBS BPA the following (non critical) error:
"VPN Port (TCP 1723) Status Error.
The System process should listen on Port 1723, but that port is owned by the_ process."
(note that the process that owns the port is not named)
uniconfinAsked:
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Ady FootSharePoint ConsultantCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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