I'm about to install ESET NOD32 Antivirus 3.0 after uninstalling McAfee Security Center. I have Windows Vista Home Premium on my PC and Windows Vista Business on my laptop (both 32-bit). Should I leave Windows Defender and Windows Firewall running on both, and if so, should I pick and choose what functions I want them to perform? (One of the main reasons I'm switching to Nod32 is that my PC is sluggish and I'm hoping the smaller footprint of Nod32 will enhance performance.) Although I've been a serious computer user for many years, and I did a considerable bit of research before choosing Nod32, I'm still a novice when it comes to knowing how the various AV and firewall programs work in conjunction with each other, so thanks for any help you experts can provide!