Thank you for your reply with the links, Nikorr.
My problem though is the Picasa storage. I have removed Picasa from my built in hard drive (to save space) but kept it on my external hard drive. Unfortunately, this is not working for me. I thought that Picasa would stay on my ext. drive. It has the shortcut icon but it doesn't open.
So, I'm wondering what other photo application I could use. I don't mind paying for it, as long as it's not too expensive. Have you got any suggestions? Thanks again for your help. Ann