I'm a student & studying DBMS.
My PC is a single user PC with no network.
I'm the only user that uses the PC.
I have a duaI boot system comprising of Windows 98 SE on volume C:\ & Windows XP SP1 on volume D:\.
I have set 1 GB as size of virtual memory on volume G:\ for both the OS's.

I recently did a typical installation of Oracle8i Enterprise Edition on Windows 98 SE.
After the installation, Universal Installer automatically ran Net8 Easy Config. I didn't know what do in it, so I cancelled it.
The Universal Installer also automatically set up my autoexec.bat file with following line:

SET Path=c:\Oracle\Ora81\bin;"C:\PROGRAM FILES\ORACLE\JRE\1.1.7\BIN";

The problem is that when I run SQL *PLUS, it asks me to enter username, password & host string. I enter SCOTT as username, TIGER as password, but I don't know what to enter in "host string". When I enter enter SCOTT as username, TIGER as password but no value for host string, it gives me the following error:

ERROR:
ORA-12560: TNS:protocol adapter error

I'm unable to work on SQL *PLUS due to this problem.
Kindly tell me how can I access SQL *PLUS, what should I enter in host string. If it has anything to do with Net8 Easy Config (that I cancelled), then kindly tell me what should enter in it.