You can learn more about spyware/adware from the following websites:
http://www.microsoft.com/athome/security/spyware http://www.lavasoft.com/trackware_info http://www.safer-networking.org/en/tutorial
http://www.microsoft.com/athome/security/spyware
http://www.lavasoft.com/trackware_info
http://www.safer-networking.org/en/tutorial