Identified externally

hi
my OS is windows 2000 professional addition
Oracle server version is 9.0.1
i created an operating system user "guest"
then set OS_AUTHENT_PREFIX=""
then i restarted the satabase
then i created a user as follows
"CREATE USER GUEST IDENTIFIED EXTERNALLY
QUOTA 10M ON UESRS"
then i assigned him previleges
now i logged on to system as "guest"
and run sqlplus as follows
sqlplus /
and it returned me error "ORA-01004"
kindly tell me did i follow the right steps???
if yes then why isnt it working
Regards

Possible Causes and Remedies:
Operating system authentication has not been enabled for the system.
Check {ORACLE_HOME} \ NET80 \ ADMIN \ SQLNET.ORA on both client and server. To enable operating system authentication it should contain the line:
SQLNET.AUTHENTICATION_SERVICES = (NTS)
If the registry key HKEY_LOCAL_MACHINE \ SOFTWARE \ ORACLE \ OSAUTH_ENFORCE_STRICT is set (true) then verify that the user is a member of one of the following NT groups: ORA_<SID>USER, ORA<SID>DBA, ORA<SID>OPER, ORAUSER, ORA_DBA or ORA_OPER.
If the Oracle database is in a different domain from the logon domain then a trust relationship must be set-up between the two domains for operating system authentication to work.
The system does not support operating system authentication. The error may in this case be accompanied by the error ORA-01988: remote os login is not allowed. Log on supplying password and username.

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>
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>
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