Ensure that “Use default gateway on remote network” in the TCP/IP settings is NOT checked. The following are detailed instructions on how to check for this setting:
For Windows XP:
Click Start > Control Panel
Click on the Network and Internet Connections icon:
Click “Network Connections”.
Note: If your Control Panel is in classic view, simply double click the “Network Connections” icon.
Right click on the new VPN connection:
Select Properties.
Select the “Networking” tab.
Verify that Internet Protocol (TCP/IP) is highlighted.
Click on the Properties button.
Within the Internet Protocol (TCP/IP) properties window:
Click on the “Advanced…” button.
Within the Advanced TCP/IP Settings window:
REMOVE the check mark next to Use default gateway on remote network.
Click “OK” to close all open windows.