Which would be fine, if I knew how to check. We seriously need a headbanging emoticon, for my personal use in computer topics.
*edit*
So I managed to ensure that neither WMP or Sonic Stage are set as default for handling videos, and temporarily disabled both the anti-virus and the Windows firewall. Still nothing doing with youtube. But it's OK, I figured out what the problem is.
IT'S AN INTERNET CONSPIRACY TO STOP ME HEARING THE NEW RADIOHEAD SONGS.