C# Website Filter

Hello, This is just a overview of what I require (More info on request). I need a C# app that 1) Starts when a user starts up windows (XP and Vista) 2) Logs every URL visited (through any browser not just IE) into a text file 3) There will be a blacklist file which contains words. If these words are found in a web page that has been requested the page will be blocked. Not a great deal of work required. ## Deliverables The code has to be commented and tests supplied