Could someone please advise me on the best anti-virus to use on my PC. I fell it’s heavily infected and my task master is disabled. I have on it a dysfunctional Kaspersky (it’s unactivated, requires an activation code which I don’t have). Any clues please?

McAfee Security Suite with Siteadvisor 2008! I've been using Mcafee since 2yrs and i've not had any problems with virus, adwares, spywares or whtsoever, cos it has one of the best "firewall" u can think of and also a siteadvisor which advices u on the level of security of the site u are visiting or about to visit. Its also easy to get along with especially for rookies. It also has version for Vista if u are using Vista. Try it! U'll never regret it.