Whatever version of BitDefender you have will determine how well it works. Is it the 2013 version? In independent lab results, it got better than it was back in 2009. For some reason, in 2009, it came horrible, and then it came back a few years later, leading on independent results. If this is the paid suite, and its 2013, I'd use it, but I still don't think it would be as effective as the options I listed above. You'd want to thoroughly remove it and restart your computer, prepared already to install the new software.