herkdriver234,
It definatley is frustrating when someone installs programs onto your computer without your permission... but unfortunately it does sounds as if your computer and/or browser has been hijacked. We would first recommend you attempt to follow the steps found in the below document in reguards to a browser hijack.
http://www.computerhope.com/issues/ch000578.htmThis should resolve many of your issues. In reguards to the popup windows, when the computer receives pop up windows without the browser window open these windows are often associated with Windows Messanger, we recommend that you disable windows messanger to make sure the popups are not traveling through this system. Information about how to do this can be found on the below document.
http://www.computerhope.com/issues/ch000519.htm