Not sure how it got on the system, but the first popup was one of the "You're a Winner!" ones--closed it by ending it through Task Manager. After that, the popups and hijacking became constant.
I ran AVG Antivirus, downloaded Avast, removed the internet connection, and scanned it with AVG, Avast, Adaware, and Spybot until everything came back clean.
Restored the connection, opened a browser, and suddenly Whitesmoke installed itself and Avast was expired.
I downloaded DDS as per the instructions here. It launched, but reports never popped up.
I have attached the GMER ark file.
Thank you for your help!