|The give away to all these fakes is that they usually report many viruses in order to panic you. In the real world you are unlikely to get more than one at a time.|
These are widely known and have been discussed many times on these forums. In fact they are less common now than they were about a year ago.
It isn't a YouTube issue in particular - they latch themselves onto various websites at times.
Always pop back and let us know the outcome - thanks