what do you want to do ? capture packets or say see the traffi pattern and usage or do some SNMP stuff just search the web there is a plethora of available software . Linux has the the best stuff like ethereal, tcpdump etc
You can put your windows machine on a network with another machine running GNU/Linux. There are many excellent portscanning and network audit tools in Linux.... nmap , nessus are among my favourites....
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