I got a The Network Adapter could not establish the connection..

hi guys,
i've just downloaded and installed oracle 10g express in my win 7 installation.
i've already created 2 tables and one user and everything seems to be ok.
but.. there's a but!!! i've tried to connect (using driver ojdbc14) from netbeans and i got a "The Network Adapter could not establish the connection" error.
the connection string is:
jdbc:oracle:thin:@pcs:1251:XE
(pcs is my pc's name).
what problem can be?
many thanks ;)

lsnrctl service
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 06-ABR-2011 01:53:14
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Conectándose a (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
Resumen de Servicios...
El servicio "CLRExtProc" tiene 1 instancia(s).
La instancia "CLRExtProc", con estado UNKNOWN, tiene 3 manejador(es) para este servicio...
Manejador(es):
"DEDICATED" establecido:0 rechazado:0
LOCAL SERVER
"ORACLE SERVER" establecidos:0 rechazados:0 actuales:0 máximo:25 estado:ready
CLRExtProc
(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\NTN_F94_50C6352F.ORA))
"ORACLE SERVER" establecidos:0 rechazados:0 actuales:0 máximo:25 estado:ready
CLRExtProc
(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\NTN_F94_50C6352F.ORA))
El servicio "PLSExtProc" tiene 1 instancia(s).
La instancia "PLSExtProc", con estado UNKNOWN, tiene 1 manejador(es) para este servicio...
Manejador(es):
"DEDICATED" establecido:0 rechazado:0
LOCAL SERVER
El servicio "XEXDB" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
Manejador(es):
"D000" establecidos:0 rechazados:0 actuales:0 máximo:1002 estado:ready
DISPATCHER <machine: PCS, pid: 3440>
(ADDRESS=(PROTOCOL=tcp)(HOST=pcs)(PORT=49160))
El servicio "XE_XPT" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
Manejador(es):
"DEDICATED" establecido:5 rechazado:0 estado:ready
LOCAL SERVER
El servicio "xe" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
Manejador(es):
"DEDICATED" establecido:5 rechazado:0 estado:ready
LOCAL SERVER
El comando ha terminado correctamente
lsnrctl status
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 06-ABR-2011 01:53:03
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Conectándose a (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
ESTADO del LISTENER
Alias LISTENER
Versión TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production
Fecha de Inicio 06-ABR-2011 00:13:13
Tiempo Actividad 0 días 1 hr. 39 min. 51 seg.
Nivel de Rastreo off
Seguridad ON: Local OS Authentication
SNMP OFF
Servicio por Defecto XE
Parámetros del Listener C:\oraclexe\app\oracle\product\10.2.0\server\network\admin\listener.ora
Log del Listener C:\oraclexe\app\oracle\product\10.2.0\server\network\log\listener.log
Recibiendo Resumen de Puntos Finales...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC_FOR_XEipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=pcs)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=8080))(Presentation=HTTP)(Session=RAW))
Resumen de Servicios...
El servicio "CLRExtProc" tiene 1 instancia(s).
La instancia "CLRExtProc", con estado UNKNOWN, tiene 3 manejador(es) para este servicio...
El servicio "PLSExtProc" tiene 1 instancia(s).
La instancia "PLSExtProc", con estado UNKNOWN, tiene 1 manejador(es) para este servicio...
El servicio "XEXDB" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
El servicio "XE_XPT" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
El servicio "xe" tiene 1 instancia(s).
La instancia "xe", con estado READY, tiene 1 manejador(es) para este servicio...
El comando ha terminado correctamente

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