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You could try creating a hosts file. Can you specify ranges in a hosts file? If so, just drop in something that directs every IP address except your network to localhost.
Or find a way to uninstall enough of IE that they can't use it anymore (from what I've heard, it's next to impossible to completely remove it). Without a browser, they can't surf the internet. If you can't swing that, install Firefox. It should cut down on the spyware, at any rate.
And if you have an extra router, you could try setting up a sub-network with just the CNC computer. On the sub-network, just forward ports 80 and 8080 to a nonexistant address.
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