Carole Abumoussa,
You have not accidently turned off the new features have you?
Go to Tools - Options - Edit Tab at the bottom of the dialog see if new
animations has a check next to it. If so, remove it. Are the schemes
available now?
If this does not help, report back.

Signature
Luc Sanders
(MVP - PowerPoint)
> Why doesn't my Preset Animation Schemes work? It is like gray and doesn't
> work. All of them don't work.