Make sure the toolbar is not locked. Then place the mouse cursor over the
vertical line of dots on the left edge so that it becomes a double arrow and
drag it down.
Then:
Download and run CWShredder, Ad-aware and Spybot. Check for updates before
running Ad-aware or Spybot.
See: http://mvps.org/winhelp2002/unwanted.htm
Also note the security tips and other important information on that page.