I was playing Team Fortress 2 last night, and got a message that I had been kicked from the server because the connect to VAC was being denied on my computer. I have never cheated in online games, and I was playing a Mann vs Machine server, where players play against waves of bots. On top of that, I have had to change the settings in firefox from 'System proxy settings' to 'No proxy' many times in the past month, and window's firewall settings are completely messed up.
Here are my logs. Thank you for your help in advance.