"more generally know how to remove botnets?"
Some security tools can detect botnets/rootkit, please check our sticky thread for rootkit scanners.
Some antivirus program like the ones you mentioned has rootkit/botnets detections.
If the infection cannot be removed or located because it is hidden and nasty, the user need to disconnect, wipe the drive and reinstall the operating system.
On AOL news today, there was a short article on Botnets, and they said that your computer might be infected with botnets if it turns on and off at random times or generally acts inconsistently. Yup, that's my computer alright (no, not this computer--the infected one is quarantined). Question is, how to get rid of them. That same article mentions Symantec (I vowed never to do business with them again), as well as Trend Micro and FireEye. Does anyone have experience with either of these latter two, or more generally know how to remove botnets? Thanks, Taz