I did all the steps you have provided. I checked the version but still shows as

SQL> select * from v$version;

BANNER
——————————————————————————–
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 – Production
PL/SQL Release 11.1.0.6.0 – Production
CORE 11.1.0.6.0 Production
TNS for 32-bit Windows: Version 11.1.0.6.0 – Production
NLSRTL Version 11.1.0.6.0 – Production

5 rows selected.

There is an error appeared in the upgrade log file:

Oracle Database 11.1 Post-Upgrade Status Tool 09-15-2010 12:29:13
.
Component Status Version HH:MM:SS
.
Oracle Server
. SP2-0042: unknown command “GRem” – rest of line ignored.
. ORA-20000: Ultra Search version is 11.1.0: patch not applicable
. ORA-06512: at line 18
. ORA-14452: attempt to create, alter or drop an index on temporary table
already
. in use
. SP2-0310: unable to open file
“C:\ORANT\Oracle11g\product\11.1.0\db_1\RDBMS\ADMIN\a1101000.sql”
. VALID 11.1.0.6.0 00:32:55
. VALID 11.1.0.6.0
JServer JAVA Virtual Machine
. VALID 11.1.0.6.0 00:00:00
Oracle Workspace Manager
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
OLAP Analytic Workspace
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
OLAP Catalog
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle OLAP API
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Enterprise Manager
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle XDK
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Text
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle XML Database
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Database Java Packages
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Multimedia
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Spatial
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Ultra Search
. VALID 11.1.0.6.0 00:00:00
. VALID 11.1.0.6.0
Oracle Expression Filter
. VALID 11.1.0.6.0 00:00:00
. INVALID 11.1.0.6.0
Oracle Rule Manager
. INVALID 11.1.0.6.0 00:00:08
. INVALID 3.0.1.00.08
Oracle Application Express
. INVALID 3.0.1.00.08 00:00:00
Gathering Statistics
. 00:02:48
Total Upgrade Time: 00:35:55

PL/SQL procedure successfully completed.

Can you please suggest any idea to get it done.
My OS: Windowsxp
Current Oracle verion: 11.1.0.6.0
Tried to upgrade : 11.1.0.7.0

sqlplus /nolog
startup upgrade
spool upgrade.log
@?/rdbms/admin/catupgrd.sql
spool off

Will running this after installing the patch update all the instances?