I have been seeing very strange pop-ups that look like a virus after I watch a video in Youtube.
The latest incident occurred after I watched a short video. Without doing anything, this pop-up popped-up on my screen while flickering.
Is this a virus? How can I get rid of it? Computer has been behaving strangely, but so far nothing very serious (thank god), I can still do things, but now and then stuff happens (most annoying is when the keyboard stops responding).