With regard to browsers, IE is among the most secure browser there is -- perhaps to a fault. Compare that to Google Chrome which is as secure as a sieve.
And then there's Microsoft Live OneCare. I actually have personal experience using the product for two years. I actually know what I'm talking about because I've used McAfee before that, and Norton before that. And I've used CA eTrust. I've compared all of them, hands-on, in real working and personal situations. Microsoft Live OneCare is the best. Easiest to use. Totally secure. And most importantly, well-behaved, something which none of the others could claim.