I'll respond in your other thread... but in brief...
3... go to TrendMicro anyway. McAfee shouldn't prevent you from running it... the worst you'll get is the two of 'em detecting each other. I never shut off my AV when I go there, and I've used McAfee, Norton, and AVG (my current preferred choice)
4... You're 9.0 flat. 9.0C is the current... the string of numbers would end with .0904. If it's still not behaving, consider bumping it up... but you can never go back
5... If you're unplugging your internet, see 2... you don't need firewall or AV then.
More thoughts on your other thread...