A week ago I installed FileZilla, which I have done several times on earlier machines.
I was in a rush and didn't spot that Yahoo was also going to be installed and set as my default browser and search engine .
I sorted this fairly easily wrt IE11, my preferred browser. It was more difficult with my secondary one, Chrome, where the installation had emptied the search engine list and inserted itself as the only one. In the end I had to reset Chrome to its defaults.
Now, whenever I boot the machine, Chrome is loaded with a mysterious white box and the Windows "working" spinner. See this link (I hope).
I eventually found the Startup folder in Win 8.1. There was some reference in there to Chrome or Yahoo, I forget which, which I removed, but it made no difference.
Does anyone know what has happened please, and how to get rid of this?