Route Table problem with new Toshiba laptop

I have a new Toshiba laptop with built-in 802.11g wireless interface
in addition to the Ethernet port. I am running WinXP MCE. I have a
proxy server with one NIC connected to the Internet via cable modem
and the other NIC connected to a 10/100 switch for the rest of the
devices in the house. I have a wireless access point connected to the
switch to provide wireless access to three laptops and one desktop.

The other two laptops and the desktop have no problems accessing the
Internet.

The Toshiba behaves as follows:

Only Ethernet port active: No problems
Ethernet port and wireless port active: No problems
Only wireless port active: Sometimes works great but usually times
out


When the wireless port is the only active connection, there are no
issues with accessing other devices on the LAN...only the Internet
causes problems. So I suspect the problem is a routing table issue
and not a radio issue.


Here is the routing table when only the wireless port is active:

================================================== =========================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 90 96 63 b2 d2 ...... Atheros AR5001X+ Wireless Network
Adapter - Packet Scheduler Miniport
0x3 ...00 02 3f 93 0a ed ...... Realtek RTL8139/810x Family Fast
Ethernet NIC - Packet Scheduler Miniport
================================================== =========================
================================================== =========================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.5 30
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.0.0 255.255.255.0 192.168.0.5 192.168.0.5 30
192.168.0.5 255.255.255.255 127.0.0.1 127.0.0.1 30
192.168.0.255 255.255.255.255 192.168.0.5 192.168.0.5 30
224.0.0.0 240.0.0.0 192.168.0.5 192.168.0.5 30
255.255.255.255 255.255.255.255 192.168.0.5 3 1
255.255.255.255 255.255.255.255 192.168.0.5 192.168.0.5 1
Default Gateway: 192.168.0.1
================================================== =========================
Persistent Routes:
None


Here is the routing table when only the Ethernet port is active:

================================================== =========================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 90 96 63 b2 d2 ...... Atheros AR5001X+ Wireless Network
Adapter - Packet Scheduler Miniport
0x3 ...00 02 3f 93 0a ed ...... Realtek RTL8139/810x Family Fast
Ethernet NIC - Packet Scheduler Miniport
================================================== =========================
================================================== =========================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.6 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.0.0 255.255.255.0 192.168.0.6 192.168.0.6 20
192.168.0.6 255.255.255.255 127.0.0.1 127.0.0.1 20
192.168.0.255 255.255.255.255 192.168.0.6 192.168.0.6 20
224.0.0.0 240.0.0.0 192.168.0.6 192.168.0.6 20
255.255.255.255 255.255.255.255 192.168.0.6 192.168.0.6 1
255.255.255.255 255.255.255.255 192.168.0.6 2 1
Default Gateway: 192.168.0.1
================================================== =========================
Persistent Routes:
None


Here is the routing table when both are active:

================================================== =========================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 90 96 63 b2 d2 ...... Atheros AR5001X+ Wireless Network
Adapter - Packet Scheduler Miniport
0x3 ...00 02 3f 93 0a ed ...... Realtek RTL8139/810x Family Fast
Ethernet NIC - Packet Scheduler Miniport
================================================== =========================
================================================== =========================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.5 30
0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.6 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.0.0 255.255.255.0 192.168.0.5 192.168.0.5 30
192.168.0.0 255.255.255.0 192.168.0.6 192.168.0.6 20
192.168.0.5 255.255.255.255 127.0.0.1 127.0.0.1 30
192.168.0.6 255.255.255.255 127.0.0.1 127.0.0.1 20
192.168.0.255 255.255.255.255 192.168.0.5 192.168.0.5 30
192.168.0.255 255.255.255.255 192.168.0.6 192.168.0.6 20
224.0.0.0 240.0.0.0 192.168.0.5 192.168.0.5 30
224.0.0.0 240.0.0.0 192.168.0.6 192.168.0.6 20
255.255.255.255 255.255.255.255 192.168.0.5 192.168.0.5 1
255.255.255.255 255.255.255.255 192.168.0.6 192.168.0.6 1
Default Gateway: 192.168.0.1
================================================== =========================
Persistent Routes:
None


I suspect the problem is with the metric setting but I don't know how
to change that.

Thanks.