If you are installing DFS-R and see
“Event ID 6402”
The DFS Replication service failed to initialize replicated folder D:\Deployments\Install because the service detected that one of its private folders overlaps with an existing File Replication service (FRS) replica set. This is an unsupported configuration.
or
Event ID 6002
The DFS Replication service detected invalid msDFSR-Subscriber object data while polling for configuration information.
Then you need to make friends with ADSI Edit.
Mine was due to a badly removed FRS structure after I broke the root upgrading to Enterprise Edition (really wanted the extra savings on replication)
Under the Server Container for your server you’ll find the records for the old FRS replication that is conflicting – delete the references for all members (yeah – even DC’s, the DC records are housed elsewhere) and Bob’s your uncle. They are GUID looking thingies here.