Hello Adam,
Firstly - welcome to
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If this thing needs to be reliable, you might want to look into basing it on an operating system other than Windows, particularly bloaty Vista.
These links may provide you with some good information:
Share GPS over TCP/IP network. - Franson GpsGate http://www.sarian.co.uk/pdf/mr4110.pdf M110 GPRS - GPS TCP/IP modem http://www.idealteknoloji.com/docume...DCS_BB-EDP.pdf
If this is for a course of some kind, you should probably talk to your professor/tutor.