In order to remove a node from a cluster and reset the clustering service in windows 2003 server we need to run a command which will reset the cluster service to its original state.
To reset the cluster service at the command prompt, type cluster node nodename /forcecleanup, and then press ENTER.
If you run the command from the node you just need to type cluster node /forcecleanup
If it doesn’t work try stoping the cluster service and run the command again.
After the command is donerestart the server and if needed you can create a new cluster.