Hey Kat -
Hopefully I didn't find your question too late, and you're done deleting the pictures you don't want and/or need.
I recommend you download and install Google's Picasa. Its a free photo image management program that will display, sort and catalog all your images and media files and allow you to easily see, sort and manage all the files you have.
It is very versatile and has helped me manage the images on my computer and delete lots of duplicates!
You can download it here: http://picasa.google.com/
Hope this helps! Itay.
