Reads in part: 1. Operating System, 2. Latest operating system service pack and patches, 3. Intel Chipset Device Software (Inf Utility), 4. All other device drivers (autio, graphics, LAN, etc.)
This is the best info I've found to date and is consistent with past practice. I install virus software last as long as only visiting trusted sites, otherwise, disable real-time virus scanning when installing additional software. I currently use Microsoft Security Essentials and have not missed the complicated problems associated with other products offering a "boat-load" of features.