It looks like the network adapter is not honoring the connection string. Are you using a static IP address? Did the IP address change after you installed Oracle before OCU was run? It looks like the dbca was run successfully, so you should be able to connect through system/password through SQL Plus. Did you try this?
sqlplus system/password@rishi-pc.acme.com:1521/wind
Thanks
Binesh
Barry Wehmiller International