I was watching a video on youtube and all of the sudden the video was replaced with my desktop. (I could still hear the video, but I was looking at my desktop and in the middle of the desktop was a dialogue from the operating system asking if I wanted to let Webroot make changes to this computer. I hesitated. Because that ususally doesn't happen. But it said it was Webroot and it showed the green icon. So I said OK and the dialog went away. I saw two webroot icons on the task bar and when I put my mouse over them, the one went away and the other one said it was scanning. I opened up Webroot and it was indeed scanning. And it found nothing. Afterwards I scanned again. And it said there were no threats. So I think it was legitimate. But still I can't say that I've had this happen before. I can here to check if anyone else had this happen, but didn't find any other posts.