oracle not connected, because the target object does not exist or host

oracle not connect, can not connect the adapter, no listener
PL / SQL login:
depending on the target host or object does not exist
Cause: The
host name and host name record does not correspond oracle, oracle could not find the host name, OracleOraDb10g_home1TNSListener service can not start

Solve:
D: \ the Oracle \ Product \ 11.1.0 \ db_1 \ the NETWORK \ ADMIN under
listener.ora, tnsnames.ora two files
to modify host = hostname
restart the computer