During installation, if they have seen the error ORA-12560, should verify the configuration of the Oracle instance you want to connect, try the following:

set ORACLE_SID=

and then try again. If this works then consider whether to make the change permanent by specifying it as a system variable.

FOR RUN THIS SID PLEASE REFER IT
Go to command prompt

C:\Document and settings\ORANGE> cd\
C:\> set oracle_sid=
e.g C:\> set oracle_sid= {press enter}
C:\> sqlplus /nolog {press enter}
sql:\>connect sys/sys as sysdba {press enter} it cant ask for password directly connected
or
sql:\>connect sys as sysdba {press enter}
password : sys {press enter}
sql:\> connected
or
sql:\> connect scott {press enter}
Enter password :tiger {press enter}
sql:\> connected
or
sql:\> connect system {press enter}
Enter password :manager {press enter}
sql:\> connected

Very nice HowTo …I tried Installing 10g the same way on solaris SPARC 64 & all sees well except that the Enterprice Manager fails to start…
Please let me know where to look for to get the EM up.

Thanks
SQL> Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 – 64bit Production
With the Partitioning, OLAP and Data Mining options
bash-3.00$ emctl start dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://b-zone.dikshapraya.blr:1158/em/console/aboutApplication
ps: unknown output format: -o cmd
ps: illegal option — cols
usage: ps [ -aAdeflcjLPyZ ] [ -o format ] [ -t termlist ]
[ -u userlist ] [ -U userlist ] [ -G grouplist ]
[ -p proclist ] [ -g pgrplist ] [ -s sidlist ] [ -z zonelist ]
‘format’ is one or more of:
user ruser group rgroup uid ruid gid rgid pid ppid pgid sid taskid ctid
pri opri pcpu pmem vsz rss osz nice class time etime stime zone zoneid
f s c lwp nlwp psr tty addr wchan fname comm args projid project pset
Starting Oracle Enterprise Manager 10g Database Control ………………………………………………………………………………… failed.
——————————————————————
Logs are generated in directory /export/oracle/product/10.2.0/Db_1/b-zone.dikshapraya.blr_orcl/sysman/log

Will appreciate your assistance.