Simple Firewall Program [closed]

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I want to make a simple Firewall/Packet-Filter program for windows using Visual C++ 2010. All I want to be able to do is see what websites my browsers go to and return custom text/HTML if I don't like the website. I really can't find any tutorials on the web for this sort of thing, and I don't know the best method to achieve this. Can anyone provide any info on how to make this simple thing? Thanks in advance...

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The Windows Filtering Platform is intended to support that kind of thing.

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The easiest way would be to program/costomize a (primitive) proxy that has a custom handler for certain URIs. Of cause this would only affect browser you told to use that proxy.