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Unable to install NFS on Windows 2008

We were working on a case in which we were unable to install NFS components on Windows 2008. Whenever we begin the installation, we get the error message:
80070643 cannot install NFS

We were also getting the error message with the event id 7001.

After researching on the issue we found that the registry key for NFS components is already created. We took back up of those keys and then delete them from registry:
a. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ServerForNFS
b. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ClientForNFS

We initiate the installation again and it completed successfully!