Laptop suddenly unable to connect via LAN. (Unidentified Network)

Hi. I've been googling and trying all sorts of solutions suggested on online help forums but none of them seem to work. Hopefully you guys can help me with it.

I'm using a laptop running windows 7, 64-bit.

My laptop isn't new, and i did not do anything out of the ordinary to it when my lan connection suddenly stopped working. I am an exchange student currently studying and living in a corridor-hostel in Sweden. Every room has a lan connection (directly from the wall). The lan connection has been working fine for the past 1 month. But suddenly, my computer is no longer able to identify it. Other people have brought their laptop to my room and are still able to connect via the lan connection. Thus it is definitely an issue with my laptop.

This is the details when i do ipconfig /all in cmd:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Windows\system32>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Samantha-VAIO
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Peer-Peer
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection* 12:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Juniper Network Connect Virtual Adapter
Physical Address. . . . . . . . . : 00-FF-A0-B6-D2-07
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : CC-AF-78-AF-1E-BD
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 74-E5-0B-15-94-7D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Centrino(R) Wireless-N 1000
Physical Address. . . . . . . . . : 74-E5-0B-15-94-7C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::b527:4915:b20d:d6cb%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.142(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, 24 February, 2014 7:16:54 PM
Lease Expires . . . . . . . . . . : Tuesday, 25 February, 2014 7:16:53 PM
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 361539970
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-9B-E9-F1-F0-BF-97-68-A6-D2

DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : F0-BF-97-68-A6-D2
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5099:7a55:420e:2517%11(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.37.23(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 200327063
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-9B-E9-F1-F0-BF-97-68-A6-D2

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter 6TO4 Adapter:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 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

Tunnel adapter isatap.{48783AE4-3F00-4D9C-9239-3944C194FEFA}:

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.{9CC4129A-3F2D-4DEF-98B9-4C8D49D3B81E}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{05808280-F12E-4200-BC96-89639D135DFC}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.liu.se:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{170E3237-DF00-41CF-BEF9-2602A937BF0A}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #6
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

And this is the error message that occurs when i type ipconfig /renew:

C:\Windows\system32>ipconfig /renew

Windows IP Configuration

No operation can be performed on Local Area Connection* 12 while it has its medi
a disconnected.
No operation can be performed on Bluetooth Network Connection while it has its m
edia disconnected.
No operation can be performed on Wireless Network Connection 2 while it has its
media disconnected.
An error occurred while renewing interface Local Area Connection : unable to con
tact your DHCP server. Request has timed out.
An error occurred while releasing interface Loopback Pseudo-Interface 1 : The sy
stem cannot find the file specified.


Ethernet adapter Local Area Connection* 12:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::b527:4915:b20d:d6cb%12
IPv4 Address. . . . . . . . . . . : 192.168.0.142
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::5099:7a55:420e:2517%11
Autoconfiguration IPv4 Address. . : 169.254.37.23
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

Tunnel adapter 6TO4 Adapter:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.{48783AE4-3F00-4D9C-9239-3944C194FEFA}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.{9CC4129A-3F2D-4DEF-98B9-4C8D49D3B81E}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.{05808280-F12E-4200-BC96-89639D135DFC}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.liu.se:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter isatap.{170E3237-DF00-41CF-BEF9-2602A937BF0A}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

I have tried setting up a static ip using the ip info copied from computers can connect to the lan connection. I have also checked that the DHCP service is up and running. I am sure you notice that the default gateway field is blank. I have tried manually setting up the default gateway via the ipv4 properties -> advanced -> add gateway. However the problem still persists. I have updated all my drivers including the realtek PCIe GBE Family Controller. Nothing seems to work. Any suggestions? Thanks!