LAN doesn't have a valid IP configuration! (ICS prob.)

I have instaled Windows 7 Ultimate 32bit on my new computer. (Dual boot with XP). On my old computer there was installed XP... so the problem is:
When i tryed to share Internet connection Windows 7 gave me an error:
"Local Area Connection" doesn't have a valid IP configuration
but files were shared and i could transfer files from one computer to the other... (only Internet didnt work)...
So i got back to win XP and tried to share connection ( XP vs XP ) and it worked great...
Then i thought: maybe windows 7 and windows XP cant share internet connection... and i installed windows 7 on the old computer (win7 vs win7)...
But then both computers came up with the same error ("Local Area Connection" doesn't have a valid IP configuration).

I tried winXP on the new comp and windows 7 on the old... and it worked great!!!
I figured out thet something is wrong with windows 7 on my new computer and i did a clean installation 3 times and the same error came up...

I tried all this things and nothing worked:

1)Disable/enable NIC
2)Install latest drivers for my NIC
3)Roll back the drivers
4)cmd -> ipconfig /refresh /release
5)Disabled ip v6
6) netsh winsock reset catalog
7)tried to manually enter IP
8)tried automatic IP
9)disabled Firewall
10)Bonjour is not instaled on my windows

I really dont know what else to do so somebody PLZ HELP!!!!

CPU: Intel Core2Duo E8400 (3.00 GHz) Motherboard: Asus P5Q SE Memory: 2GB Kingston DDR2 Graphics Card: GeForce 9800 GTNIC: Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller
(i downloaded drivers for NIC at ASUSTeK Computer Inc.)I attached some screenshots and my IPCONFIG

i set up a stactic ip addresses on both computers (i used this guide Get A Static IP! How to set a static ip address for your computer (for p2p, web servers, bittorrent, etc) for Linux, Windows, and Mac.)...
but im not sure how to disable the ,,mode/router's DHCP server''.
My old computer is connected directly to new computer through NIC, and modem is connected to new computer through USB.

tonibgd said:

i set up a stactic ip addresses on both computers (i used this guide Get A Static IP! How to set a static ip address for your computer (for p2p, web servers, bittorrent, etc) for Linux, Windows, and Mac.)...
but im not sure how to disable the ,,mode/router's DHCP server''

How exactly did you configured your static IPs? screenshot your ipv4/6.

As for changing auto DHCP to Static IP, your router's control panel has these setting which you should select.

But if you have applied static IP to your machine (ipv4/6), that setting is void, per machine that you have set it as static ip.

Your default is 192.168.1.1, why two same screens?