ORA 12203:UNABLE TO CONECT TO DISTINATION

Hi to all
as i once again login at this time, the error is frestrating me.
i hve a single user PC of AMD structure using windows XP as an OS.
i hve installed oracle8i,oracle9i,& d2k . one byone.first i installed oracle 8i . when i got complete the installation it says its sucesfully installed . & i gofor the login . when i write user name / password as scott / tiger its give me an error like this
ora 12203 :TNS : unable to connect to destination.
secondly i uninstalled oracle 8i & install 9i . but at same poit of login same error came.I have already tried 6 to 7 time to install any one of this version but i failed to login. i already check the file tnsnames.ora but i c'nt understand the meaning of listener. some body can tell me what i have to do. kindly note that i have 8i & 9i & a single pc not a network / lan connection.

installed . & i gofor the login . when i write user
name / password as scott / tiger its give me an error
like this ora 12203 :TNS : unable to connect to destination. Where you gave scott/tiger
secondly i uninstalled oracle 8i & install 9i . but
at same poit of login same error came.I have already
tried 6 to 7 time to install any one of this versionWhen you have uninstalled oracle Server , where you going to connect.
For connect , you must have database up/running/open.
So install 8i/9i and create database
but i failed to login. i already check the file
tnsnames.ora but i c'nt understand the meaning of
listener. some body can tell me what i have to do.
kindly note that i have 8i & 9i & a single pc not a
network / lan connection.Start listener
lsnrctl start
and make tns entry in tnsnames.ora . When try to connect from sqlplus etc use connect string ( tns entry ) like
sqlplus scott/tiger@orcl8i
- Virag Sharma
http://virag.sharma.googlepages.com
http://viragsharma.blogspot.com/

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    (c) Copyright 1997 Oracle Corporation. All rights reserved.
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    HTH
    Aman....

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