Oracle11g ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

在windows server 2008安装了oracle11g，oracle11g一直运行得很好，但是最近却出现了一些问题，oracle配置文件如下：
listener.ora文件
# listener.ora Network Configuration File:
C:\oracle\Administrator\product\11.1.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = TEST)(PORT = 1521))
)
)

sqlnet.ora文件
# sqlnet.ora Network Configuration File: C:\oracle\Administrator\product\11.1.0\db_1\network\admin\sqlnet.ora
# Generated by Oracle configuration tools.
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

tnsnames.ora文件
# tnsnames.ora Network Configuration File: C:\oracle\Administrator\product\11.1.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
TESTONE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = TEST)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = TEST)
)
)

TEST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = TEST)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = TEST)
)
)

使用如下方式登录，是正常的
c:\>sqlplus scott/tiger
SQL>

但是使用下面方式登录，却无法登录
c:\>sqlplus scott/tiger@TEST
ERROR:
ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

c:\>sqlplus scott/tiger@TESTONE
ERROR:
ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

使用lsnrctl命令查看状态
c:\>lsnrctl
LSNRCTL> status
监听端点概要...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=TEST)(PORT=1521)))
监听程序不支持服务
命令执行成功

我曾尝试删除数据库，然后新创建数据库，一切正常，可以访问，可是系统重新启动后，又无法访问了。
如何解决上面的问题？

谢谢！