Oracle Database Express Edition (XE)

Hi All
I am facing error "ORA-12518: TNS:listener could not hand off client connection" while using 10G R2 XE edition on Win 7 64bit.
I know XE is 32bit, my OS is 64bit but it was working properly till last week when I had to format my system. Now its not working.
I know there have been similar discussions on this topic, but none resolution worked for me.

Here is my listener.ora

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\app\oracle\product\10.2.0\server)
(PROGRAM = extproc)
(DIRECT_HANDOFF_TTC_LISTENER=OFF)
)
(SID_DESC =
(SID_NAME = XE)
(ORACLE_HOME = C:\oracle\app\oracle\product\10.2.0\server)
(PROGRAM = ORCL)
(DIRECT_HANDOFF_TTC_LISTENER=XE)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
# (DIRECT_HANDOFF_TTC_LISTENER=OFF)
)
)

Here is TNSNAMES.ORA

xe =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = dedicated)
(SERVICE_NAME = xe)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)


Here is o/p of lsnrctl status:

LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production
Start Date 29-DEC-2012 14:43:04
Uptime 0 days 0 hr. 13 min. 38 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:\oracle\app\oracle\product\10.2.0\server\network\admin\listener.ora
Listener Log File C:\oracle\app\oracle\product\10.2.0\server\network\log\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "XE" has 1 instance(s).
Instance "XE", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

I cannot set PROCESSES parameter as when i do : sqlplus sys/****@xe as sysdba, it sayd connected to idle instance. Any query says " Oracle not available".

Please help.