While I admire your persistance in sticking with this problem for at least a month, I'd have to agree with Tony. If you're irritated enough with your OS, and you've asked the very intelligent people here for their advice, and it still doesn't work, then it's time to have that "fresh, clean feeling" of a new install. It's nice, you should try it

And next time, may I suggest AVG Antivirus from Grisoft? It's free, with free updates, and the new free version is quite good.