OK, a few issues with the update. I'm running Windows 7 by the way.
Firstly, as someone has mentioned in another topic, on startup of my system the "Change of homepage detected" window pops up, but it does not list a change and I do not use Internet Explorer anyway.
At the same time this website opens on Firefox
Also, when I right click on the icon on the taskbar at the bottom right of my screen and click "Scan for spyware, adware, malware..." nothing happens and when I right click on the icon after I have tried that, the menu doesn't even appear.