My media players aren't working, any help?

I have 3 media players; Windows Media, Quicktime, and RealPlayer. None are working. I know my Windows Media is down because of CoolWeb something or other, but it still worked for videos from websites. RealPlayer still plays music but it doesn’t play video clips from websites. When I try to use Quicktime to play movie trailers all I get is the Quicktime logo in the middle and a “-2003” where the play button should be. All three programs were working fine 2 days ago. Anyone know whats up?