This behavior can also be caused if the following registry
key is corrupted or missing:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols

RESOLUTION
Resolution 1
To resolve this behavior, uninstall and then reinstall
TCP/IP from the Windows 2000-based computer. For more
information about how to uninstall and install TCP/IP, see
the "More Information" section of this article.

NOTE: Remove TCP/IP as your last step after you have tried
all basic troubleshooting steps.
Resolution 2
To replace this registry key, export the key from another
computer, and then import it on the affected computer. How
do I import/export from the registry?

wrote in news:1f10901c389b3$2d3a1b80$(E-Mail Removed):

> This behavior can also be caused if the following registry
> key is corrupted or missing:
> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
>
> RESOLUTION
> Resolution 1
> To resolve this behavior, uninstall and then reinstall
> TCP/IP from the Windows 2000-based computer. For more
> information about how to uninstall and install TCP/IP, see
> the "More Information" section of this article.
>
> NOTE: Remove TCP/IP as your last step after you have tried
> all basic troubleshooting steps.
> Resolution 2
> To replace this registry key, export the key from another
> computer, and then import it on the affected computer. How
> do I import/export from the registry?
>
Run regedit.exe
Go to the Help menu Index and find
"Exporting registry files"
"Importing registry files"

Backup the registry before proceding with modifications.

You may wish also to consult the MS KnowledgeBase perhaps search on
"regedit.exe" and "editing the registry"