screen saver does not start

Hello everyone!
Hello i have problem regarding to my screen saver. It does not start, whether on my laptop or my desktop .... I choose the "bubble" of Vista! I am well "apply" and nothing happens ...

Any idea whats happening with me?

Thank you for your help!

hello
How long did you put in the limit? or wait time in minutes.

I put 1 minute because nothing changes! I'll try something else as a screen saver! thank you!

it is hardly surprising that two different computers have exactly the same problem ... So in summary, whatever the theme and whatever the time it will not
right?
when you click on "Preview" what is your screen saver is displayed? then tries to choose no screen saver "apply" now again choose a new screen saver and then "apply"

Well I finally found! I must put in screen, an image of windows (in my PC ....), for the screen saver starts on the way! thank you for your advice! Good evening!