A very basic info video on what botnets is and how to better protect oneself.
As long people use any of the top 10 security softwares one is normaly very well protected.
Here are 2 free tools you could test to see if your pc possible is connected to a Botnet:
http://free.antivirus.com/rubotted/
http://www.bothunter.net/
/UpNorth