Wireless adapters or dongles usually need drivers for OS X before they can work. Most carriers (AT&T, Verizon, T-Mobile, NetZero) have wireless adapters specifically for Macs and they work well.
I can't find any info at all on a Netgear WDN 4100. Are you sure that's what it's called? Here's the LINK to the Netgear store which sells wireless adapters.
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