This post was published 4 years 5 months 28 days ago. Therefore, it may well be out of date. Do not reply on the contents of this post being accurate. 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.