Oracle Developer Suite Applications Can't  connect to Oracle 8i database

Hello,
I have Oracle 8i installed on my PC.
Now I have installed Oracle Developer Suite on it.
During the installation it never asked for a Oracle home directory. It may be detecting the same.
It has created separate menus and configuration files like tnsnames.ora for this installation. The SQL * Plus version is also different, which is 10.1.0.4.2.
Now when I try to connect using usual scott/tiger authentication it gives error
ORA-12560: TNS: Protocol adapter error.
Even after correcting the tnsnames.ora file, which is installed by DS with proper service name, the problem persists.
Please help.
-Sameer

I have uninstalled Oracle 8i.
Removed all the services from Windows services by deleting corresponding registry entries and deleted the Oracle folder.
I have reinstalled Oracle 8i, this time i changed the name of global database to oracledb.
I channged the tnsnames.ora file from DevSuite appropriately as:
# tnsnames.ora Network Configuration File: C:\DevSuiteHome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = mscserver)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ORACLEDB)
Still it can't login using scott/tiger authentication.
What may be the problem? Please help.
-Sameer

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