DU is the only thing I'm running on the laptop.
Check your computer for malware.
He did, and found it. He just doesn't want to recognize it as malware.
More seriously, judging by
this post on another site, I'm not sure if Opera is a live product on computers. I tried Opera sevral years ago and
HATED it. As I posted there, I use Chrome, but I don't love Google (or Mozilla, for that matter). The Pale Moon browser one member mentioned there sounds interesting to me.