Windows 7 could someone help me fix the "unidentified network" problem?

[genius3008]

sorry for my bad English. I'm a Vietnamese so if there were any problem with my language, please ignore it. I've known a password of a wifi and have connected it for 4 months with no problem. But on a beautiful day, it turned out to be "unidentified network" and "limited access". I tried everything I search on Google but nothing seem can fix my problem. Here what I tried:
1. Go to services, try to find ##Id_String2.6844F930_1628_4223_B5CC_5BB94B87 9.762 but couldn't find it.
2. Configure the "wireless network connection" --> tab advanced --> set the value of Network Address with 12 any numberic digit but nothing happened.
Is there anything else I can do?
here's the "ipconfig/all" of my laptop:

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Windows\system32>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : DUC-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Mixed
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR8131 PCI-E Gigabit Ethernet Con
troller (NDIS 6.20)
Physical Address. . . . . . . . . : E0-CB-4E-57-6B-BC
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR9285 Wireless Network Adapter
Physical Address. . . . . . . . . : 00-25-D3-CE-C2-79
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::48ef:c10:5a2e:c86f%13(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.101(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, 02 April, 2011 10:25:19 AM
Lease Expires . . . . . . . . . . : Sunday, 03 April, 2011 10:25:19 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234890707
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-C9-9C-CB-00-25-D3-CE-C2-79

DNS Servers . . . . . . . . . . . : 203.162.4.190
203.162.4.191
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{19674EB5-1840-4D36-9D68-9A8CE7798115}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{27EAC015-0E02-4357-B48A-FA9DDF180C18}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

thanks so much if someone can help me fix it!