Do you have pop-ups? Unwanted ads? Toolbars you don’t want? Does your computer start up to a page that you didn’t choose?
You probably have some sort of software on your computer that’s doing this. If you’ve ever seen anything like this, and if you use Chrome, there’s a great tool that Google offers: the Chrome Cleanup Tool.
https://www.google.com/chrome/cleanup-tool/
Check it out!