This post was published 3 years 30 days ago. Therefore, it is likely to be outdated and may no longer be valid.
Security blog www.security-watchdog.co.uk has a great video showing the types of adware and spyware that botherders seek to install on your PC.
In the video David Marcus from McAffee shows how a system can be infected by half a dozen applications without the user’s knowledge or consent.