My pictures in screen saver

[Brown]

I have a coputer with Window XP home eddition/personall, I
have the followin two questions:

1- In the screen saver drop down list there is not my
picture slideshow to select, it was there before, but not
anymore, they are gone, how do I add my pictures slideshow
again to the screen saver.

2- I have three 3D screen saver, there were working fine
for a long time, suddenly stop working. Anyone who knows
how to fix it again.

Thanks for for any one help for this matter.