I posted it in microsoft.public.windows.networking.wireless but so far no
one there was able to help me.
Configuration of part of my network fallows:

Computer 1 (Vista) Internet connection is ok:
ADSL modem (USB)
IP address is diffrent every time I connect to the internet.
Now it's 83.27.7.181.

LAN (ICS Host)
IP address: 192.168.0.1
subnet mask: 255.255.255.128

WLAN
IP address: 192.168.0.129
subnet mask: 255.255.255.128

Computer 2 (XP) Internet connection is ok:
LAN (ICS Client)
IP address: 192.168.0.2
subnet mask: 255.255.255.128
gateway: 192.168.0.1

Computer 3 (XP) No internet connection:
WLAN
IP address: 192.168.0.132
subnet mask: 255.255.255.128
gateway: 192.168.0.129

When there was Win XP on Computer 1 all I had to do was manualy seting up IP
address of DNS server on Computer 3 and I had internet connetion there. Now
it is'n working. Why? I know I could set up a network bridge on
Computer 1 but I don't want to.

I can ping both Computer 1 and Computer 2 from Computer 3 but when I'm
trying to ping something in the internet there is no answer.

I know I could solve this problem by creating the network bridge on Computer
1 but I don't want to do it.

Rafa³