Windows update broke my internet →
The latest windows update borked my computer so I had to do a system restore back to yesterday, then when I got the prompt to install the two new updates (malicious software removal tool and some security update) I went to 'custom' and then unchecked them both. XP Home, btw, with Zone Alarm Pro and Avast anti-virus.
I don't know what it did that broke mah intarwebs, but nothing I did with my anti-virus or firewall could fix it. I just couldn't connect to the net. So, if you have a problem after a Windows update, restore to the day before and don't install those updates. I'm of the view anyway that most of those 'malicious software removal' and 'security update' things are unnecessary anyway.