ORA-12560: TNS:protocol adaptor error after delete one database - oracle11g

Question

i have oracle11g desktop. For my project I create 3 databases via configuration assistant tools. Then I delete one of them
and after this I have the error: ora-12560.
By mistake both of my databases have the same pasword,
for example: when i want to connect one of these data bases with system user, i have one pasword and perhaps the databases dont know connect which one.
I start all services
set oracle_sid=orcl.
I run lsnrctl
tnsping check tansname.ora & my listener.ora
and I logon with sysdba#oracle_sid
but i have this error again
pleas help me
tnx

Answer 1

sounds like the database is not up. you probably restarted your machine and the instance is not set to autostart
C:\Documents and Settings\tkyte>sqlplus scott/tiger
SQL*Plus: Release 10.1.0.4.0 - Production on Thu Sep 6 15:43:55 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.4.0 - Production
With the Partitioning, OLAP and Data Mining options
scott%ORA10GR1> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.4.0 - Production
With the Partitioning, OLAP and Data Mining options
C:\Documents and Settings\tkyte>net stop oracleserviceora10gr1
The OracleServiceORA10GR1 service is stopping.........
The OracleServiceORA10GR1 service was stopped successfully.
C:\Documents and Settings\tkyte>sqlplus scott/tiger
SQL*Plus: Release 10.1.0.4.0 - Production on Thu Sep 6 15:44:35 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus
C:\Documents and Settings\tkyte>net start oracleserviceora10gr1
The OracleServiceORA10GR1 service is starting..........
The OracleServiceORA10GR1 service was started successfully.
C:\Documents and Settings\tkyte>sqlplus scott/tiger
SQL*Plus: Release 10.1.0.4.0 - Production on Thu Sep 6 15:45:12 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.4.0 - Production
With the Partitioning, OLAP and Data Mining options
scott%ORA10GR1>

Answer 2

I have got the same error after delete a db (in the window enviroment) and I resolved as following
the first way:
C:> SET ORACLE_SID = SID NAME
the second way:
Use regedit locate to path: HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_HOME_NAME
update ORACLE_SID =
refer at: https://docs.oracle.com/database/121/ADMQS/GUID-EC18C4A6-3BA5-4C14-9D76-B0DD62FEFFF2.htm#ADMQS12369