It sounds like it didn't give you a location or name for the file? Without that, you won't be able to tell whether it's a dangerous file or simply a false positive (something that it thinks is a virus but really isn't).
I have Adobe v. 10 on Firefox v. 3.0.6 on Vista. I have Adobe v. 10. I get "We're sorry, this video is no longer available" on most of the videos I try to watch. Like on this one, http://www.youtube.com/watch?