This depends if you are using firewall on each of the computers on the network. Anyway try to look for a kind of Audit software source code. This should help you to solve the matter quicker. It is not so easy to make such applications and google-ing is mandatory to event start with C or C++.
Also many today computers don't have a Floppy drive, therefore you would have to use an USB drive for it. And that is another quite a large problem. Therefore I would suggest to get or build a LinuxPE or BartPE kind of image on the USB drive with attached applications that you need to scan the network.
CD and DVD is read-only, so I don't suggest this option to you.
Please check the sentences if you use any translators. It won't help you asking on english forums like Daniweb, when you have none or a little knowledge of English.
I had to learn English too, to be able to work with computer science.
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