Flash Player works for Administrator but not other users

I have Flash Player 10.2.153.1 installed and I am running Windows Vista 32-bit and Windows Internet Explorer 8.  If I am logged in as the Administrator I have no problem watching video previews from the Odeon and other similar websites.  However, if logged on a Standard user account Odeon film previews cannot be seen - all I get is a blank white viewing box with a small square box in the top left corner with the colours red, green and blue in it (it is too vague to make out what the logo is even when zoomed in).  The inability to watch video clips for Standard users seems to be random as some sites work while others do not?  Can anyone help solve this problem?  Why do I have this problems for the standard user accounts on some websites but not at all for the Administrator account on any website ???