Windows 7: full screensavers not loading properly

Hello,
I am having trouble loading mulitple screensavers from www.fullscreensavers.com Everytime I download a screensaver from this site it loads but saves to the desktop and a file in c/; drive it also goes into screensavers and I can use it, but if I download another one it covers the one I already downloaded so it will only play the one downloaded at the time I can find the others that I downloaded saved in programme files/fullscreensavers, but it saves them separately and won't combine them to run consequtively. when i go into control panel personalization and check my display only the most recent screensaver is listed. They are in a folder in my programe files but not in screensavers. I don't know how to get them to run as multiple screensavers and change randomly. its very frustrating as they are really nice screensavers but I can only run one screensaver and if I change it I have to download another screensaver again and use only that one, so instead of adding it into screensavers it just replaces the previous one. I can't add the one's already loaded on the desktop or the ones already in the fullscreensaver file in programe files so the screensaver only plays one screensaver over and over. Is there a way to fix this on my desktop computer. it runs fine on another computer at home and changes all the screensavers downloaded randomly. But not on this computer. Please can someone help any suggestions how to solve my problem. Thank you.