Belkin F5D7011 - Manual (Page 42)

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Troubleshooting
Card does not perform or connection is unstable when computer has
a second built-in wireless network card (such as a mini PCI or
Intel® Centrino™)
This condition occurs if your computer has a built-in wireless
card while your Belkin Wireless Card is also active. This happens
because Windows must now handle two active
wireless connections.
You need to disable the built-in wireless card from your computer
under “Network Adapters” in the Device Manager.
Card does not perform or connection is slow when computer has a
built-in wired Ethernet card
This condition occurs if your computer has an active Ethernet
card while your Wireless Adapter is also active. This happens
because Windows must now handle two active network
connections.
You need to disable the Ethernet card from your computer under
“Network Adapters” in the Device Manager.