I got a laptop in to look at "running slow and keyboard not working sometimes" fairly recently from a local friendly lady customer, and it was obvious the source of its sickness was spyware. In fact the keyboard issue was two keyloggers fighting each other for control, and it went on to have a further 265 spyware/malware/virii infections. Its related to this because we reckoned the primary source of it was webcam sites, especially as it managed to sign on to a local neighboring wifi point despite the wifi being disabled according to the icon, and attempt to solicit some business from me while I was working on it from a camgirl apparently on first name terms with her brother.
There wasn't even a attempt to hide the use though, even the desktop was covered with pictures of of her brother in awkward positions, very bizarre.
We just removed the problem and sent it back with a note not to return it for work again...
Biting the hand that feeds IT
