intrusion detection, question

i am trying to use
-Securepoint Intrusion Detection System 2.0.9
Nuzzler Basic Edition-
at first start up it brings up SETTINGS
under the General tab it wants me to select a netowork adapter
choices are

[\device\packet_{36036df0-9b5c-4fa5-b826-56749}
\device\packet_NdisWanIp
\device\packet_NdisWanIpx] (this is a drop down list of 3)

next there is a field
"Network Segement"
"specify INTERNAL Network Variable"
["192.168.3 <-please change this value!!!] (note: [ ] means text or drop down feild)

i am honestly not sure what i am spose to chose here. (i am new to this and i am sure this program is made for people beyond my skill level, but this is how i learn)

here is my computer info

windows XP

router = MN500 (microsoft wireless)

NIC = Realtek TRL8139 Fast Ethernet Adapter <-i am not sure which of my three choices would indicate this, if i had to guess i would say the one with all the hex #s)

I allso have 2 wireless laptops, an APPLE (Imac), and and xbox on my network, allthough the xbox is not really hooked up right now i still keep its mac in my mac filtering thingy.
not sure any of this makes a dif but there it is.

in the section
"Network Segement"
"specify INTERNAL Network Variable"
i am guessing this is my routers gateway address?

so the question here is what am i spose to put in the fields mentioned above. thanks,