Reading that article reminds me that I just removed a mentioned trojan/worm (Agobot - a total of four variants and seven different infected files, including inside the System Restore files) from a local business's PC. It was a pesky little ah heck. McAfee was letting it run. I had to install NOD32 to finally kill it. Even then, it kept coming back until I rebooted with the LAN cable unplugged.