If this approach interests you, RogueKiller is a scanner to consider - and not just for the cute icon. Using two different antivirus software is often recommended against, but it's not a bad idea to have a heavy-duty, all-purpose solution be accompanied by a malware-focused scanner to run from time to time.
It's best you come prepared to face any such eventuality, and using competent antivirus software is the way to go about it. As programs and websites get increasingly complex, so do the chances of malware getting through a backdoor. Malware always finds a way to get into your PC, whether you know it or not.
