XP prefers ad-hoc WiFi over Wired net (BAD)

OK, here is the situation. I am trying to get my Palm TX to access the
Internet through my Windowx XP Pro SP2 system. I do not have a wireless
router. Instead, I bought a D-Link DWL-G122 USB WiFi adapter. The reason
is that I want to do WiFi with my Palm TX at my home and when I visit my
parents. I will configure they WinXP Home SP2 PC with the same setings.
So, when I visit them, I just bring my USB WiFi adapter with me.

OK, this is what I have done:

Main wired LAN to the Internet settings:
All settings obtained via the router's DHCP server.
Let say the IP address of the PC is 192.168.x.3

I've a ad-hoc (peer-to-peer) WiFi net for the Palm TX with a SSID of
let's say txnet. For txnet, I gave it the following fixed settings:

PC WiFi:
IP Address: 192.168.y.2
Subm Mask: 255.255.255.0
Gateway: 129.168.y.1 (virtual gateway)
DNS: 192.168.y.1
Data encryption: WEP
Key length: 128bit (104 + 24) 13 ASCII Characters

Palm TX:
IP Address: 192.168.y.3
Sub Mask: 255.255.255.0
Gateway: 192.168.y.2
DNS: 192.168.y.2
Data encription: WEP
Key length: 104bit passphrase

OK, it seems that the PC and the Palm TX can connect to each other. But,
when I bring up my WiFi connection, I lose Internet connectivity on my PC
via the wired LAN. When I disconnect the ad-hock WiFi conneciton, my
Internet connction via the wired LAN comes back.

So, it seems that the PC prefers to use the WiFi connection as its primary
Internet connection when it is up. I don't want this. I want to the
wired LAN to always be the prefered Internet conneciton for the PC. But,
I want the Palm TX to be able to share the wired LAN connection through
my PC.

I have noticed that my wired gigabit NIC (D-Link DGE-T530) now has an
"Alternate Connecton" tab when I bring up its TCP/IP properties. It is
also set up to obtain its config from DHCP as well. Is this the problem?

Any help will be appreciated.

Thanks,
Steven
.

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