Belkin F6D6050v1 User Manual page 53

This condition occurs if your computer has a built-in wireless card while your
Belkin N+ Wireless USB Adapter is also active. This happens because Windows
must now handle two active wireless connections.
You must disable the built-in wireless card from your computer under "Network
Adapters" in the Device Manager.
The Adapter 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
Adapter is also active. This happens because Windows must now handle two
active network connections. You must disable the Ethernet card from your
computer under "Network Adapters" in the Device Manager.
What's the difference between 802.11g and draft 802.11n?
Currently there are three commonly used wireless networking standards, which
transmit data at very different maximum speeds. Each is based on the
designation for certifying network standards. The most common wireless
networking standard, 802.11g, can transmit information up to 54Mbps; 802.11a
also supports up to 54Mbps, but in the 5GHz frequency; and 802.11n draft
specification can connect at up to 300Mbps. See the following chart for more
detailed information.