Hi guys
Just turned on my PC and was immediately informed that an Adobe flashplayer update was apparently required. I updated accordingly and restarted then logged in to a couple of websites only to find that I was unable to play any video files and was told I needed to update to flashplayer 9

I clicked on the update link and was told something called activex (or similar) would be downloaded and within a few seconds everything was working as normal. My questions are what is activex? why didn't it get downloaded/activated with the first update? and is there any need for concern e.g. security issues.
Remember who you're reply to so please keep your answers nice and simple for me!!