Windows Live Photo Gallery excels at handling and presenting your photos.  To see your photos in a slideshow, follow these steps:

Pick the photos that you'd like to see in a slideshow.  You can pick and choose photos by holding the CTRL while clicking the photos you like.  Once you have picked several, press the Slideshow button   .

You can scroll through the photos in your slideshow by hitting the right and left arrow keys.  When you're all done and would like to exit the slide show, press the ESC key.

Next: Add Tags to Photos and Videos