flash movie only works on some machines not others

[jonnew]

made a simple flash movie but when Ive tested it it only works on some of the computers and not others even though the hardware is the same even in the office where the pc' s r the same some people get joy when others pain can anybody shed light on this situation.

http://www.manholes.co.uk/test/mainmenu/CompInfo/manpro.htm

help.

thanks in advance

john.