Configure two NIC cards running Windows XP

Hi to all Network Experts!

My problem is that i could not figure out how to configure my PC with an Internet connection and at the same time LAN connection.
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I have 2 NIC cards:
First card is onboard Ethernet Card. This card is used for my LAN Connection.

Second card is a Raltek NIC that i want to use for internet connection.

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IP for the 2 NIC Cards:
First Card (LAN Connection): 172.16.3.100 subnet: 255.255.255.0 gateway: 172.16.3.245

Second Card (for Internet): 192.168.1.102 subnet: 255.255.255.0 gateway: 192.168.1.1

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The internet modem/router is connected to a onboard NIC card .
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If I remove the gateway on local LAN IP then I am able to access the internet. But I cannot remove the gateway (192.168.1.1) as I have VPN network who uses the gateway 192.168.1.1
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Can anyone help me? please...