Go to control panel - add / remove programs - tick the box to "Show updates" - wait while list populates then scroll down looking for Internet Explorer update - once found select it and uninstall.
This will roll IE back one version and remove all nasties.
whilst at add / remove programs you may see a few programs installed on the same date, about the date things first when oops, remove all of these programs - reboot
Go start - All programs - look for Internet Explorer No add ons and open this. type in www.gogle.co.uk and Enter. Then open options and set google as your home page, for now.