Connected, no connection.

Hello everybody,

I'm having something realy annoying: since four or five days I was having problems with tcp ports that wouldn't open, no matter what I turned off on my computer(firewall, uac) while it was working the days before (hosting Warcraft3 games worked, and then didn't anymore.) Ports seems like they were closed.

So I tried different things to get it work, update drivers, update my router firmware but no way.
Here comes the real problem:
The only thing I achieved was to be connected, but not connected anymore, let me explain: I'm connected to the network with no problem on sharing/seeing other computers, no problem to access internet but windows7 keeps saying that I'm not connected, which prevents my computer from beeing in a homegroup and of course the opened port problem is still there.
Here is a pic of what I see:
http://www.lama-kun.ch/connection.jpg
If anyone could help me, I haven't found anything on how to get it back.

Thanks,
Hazilo

Here is the ipconfig:

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

C:\Users\Adrien>ipconfig /all


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : dclient.lsne.ch
Description . . . . . . . . . . . : Atheros L1 Gigabit Ethernet 10/100/1000Ba
se-T Controller #2
Physical Address. . . . . . . . . : 00-1F-C6-20-F8-85
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::9976:6132:aaa9:1a73%21(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.123.105(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : mercredi 30 décembre 2009 11:01:00
Lease Expires . . . . . . . . . . : mercredi 6 janvier 2010 11:01:00
Default Gateway . . . . . . . . . : 192.168.123.254
DHCP Server . . . . . . . . . . . : 192.168.123.254
DHCPv6 IAID . . . . . . . . . . . : 352329670
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-28-10-A4-00-1F-C6-20-F8-85

DNS Servers . . . . . . . . . . . : 192.168.123.254
NetBIOS over Tcpip. . . . . . . . : Enabled

I'm can access other computers shared folders, printers and all, I see them in Network, but still it says "This computer is not connected to a network. Click to connect..." and when I clic and choose connect to a network a box over the network icon in taskbar opens and shows this:
http://www.lama-kun.ch/connection2.jpg
Edit: my network is: 2 comps on gb switch in chamber <-> gb switch in living room with another comp on it <-> router

No I'm not trying to connect to my wireless as I have no wireless card on it, it's a wired network.

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

C:\Users\Adrien>ipconfig /all

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : dclient.lsne.ch
Description . . . . . . . . . . . : Atheros L1 Gigabit Ethernet 10/100/1000Ba
se-T Controller #2
Physical Address. . . . . . . . . : 00-1F-C6-20-F8-85
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.123.105(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : mercredi 30 décembre 2009 13:42:18
Lease Expires . . . . . . . . . . : mercredi 6 janvier 2010 13:42:18
Default Gateway . . . . . . . . . : 192.168.123.254
DHCP Server . . . . . . . . . . . : 192.168.123.254
DNS Servers . . . . . . . . . . . : 192.168.123.254
NetBIOS over Tcpip. . . . . . . . : Enabled

Actually nothing changes without ipv6.

Here it is:

C:\Users\Adrien>ping 192.168.123.254

Pinging 192.168.123.254 with 32 bytes of data:
Reply from 192.168.123.254: bytes=32 time<1ms TTL=127
Reply from 192.168.123.254: bytes=32 time<1ms TTL=127
Reply from 192.168.123.254: bytes=32 time<1ms TTL=127
Reply from 192.168.123.254: bytes=32 time<1ms TTL=127

Ping statistics for 192.168.123.254:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms