Wireless Video Problem!!

[djflish]

I've just set up my wireless internet connection, but now I can't watch streaming videos.
If they open in the browser it just says Ready, instead of buffering, etc. and if it opens WMP, it says 'This file is on the Internet, connect to the internet'.
But I am on the internet!
I can download them and then watch them, anybody have any clue why it is doing this?
It worked fine when I had the physical connection.