This server is an active node in a failover cluster. Uninstalling the Failover Clustering feature on this node may impact ...

This server is an active node in a failover cluster.  Uninstalling the Failover Clustering feature on this node may impact the availability of clustered services and applications.  It is recommended that you first evict the server from cluster membership.  This can be done through the Failover Cluster Management snap-in by expanding the console tree under Nodes, selecting the node, clicking More Actions, and then clicking Evict.