Help: Error message "ORA-12560 TNS:Protocol Adapter Error "

Question

I tried to install Oracle 8i EE version 8.1.7 on Windows 2000. Everything is OK until the installation proceeded to installing "Oracle Database Configuration Assistant". At that point, I got an error message "ORA-12560 TNS:Protocol Adapter Error (network not loaded)". I looked up the error message. The cause of the error said: "This error occurs when the SQL*Net driver cannot find the JSB driver because you may have either forgotten to load the JSB driver (for instance MFTP) or used an incorrect TCP_VENDOR key (for example, TCP_VENDOR=NOVLWP).". And the suggested action said: "Load the JSB driver or use the correct TCP_VENDOR key.". I am using a standalone PC with Windows 2000 at home, and the PC does not connect to any network(except that I can dialup to internet via modem). What should I do? I can't understand the error message. Any expert to help me overcome the error?
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Answer 1

database tnsnames.ora
=========
# TNSNAMES.ORA Network Configuration File: D:\Oracle\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = mohsin-pc)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORCL)
INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = mohsin-pc)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = MODOSE)
(PRESENTATION = http://HRService)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
developer 10g tnsnames.ora
==============
# tnsnames.ora Network Configuration File: D:\Forms\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.132)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = Dedicated)
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = mohsin-pc)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORCL)
Please tell me what changes I needed
database serivice name is "ORCL'
and my pc name is "mohsin-pc"