Computer Taken Over - Add Remove - Uninstall Desktop

My sister's laptop, (Windows XP) is freezing up and having a lot of trouble accessing the internet. She thinks it's from an e-mail that she downloaded a screen saver from. It has to do with a web page called freeze.com, 3D Dolphins screen saver, desktop weather and a couple of other things that all downloaded at the same time.She has to go to Control, Alt, Delete to try to get the laptop to shut down and then has to click on "End Now" several times. I will attach a picture of the list.Also, when she goes to "Add & Remove", it won't let her uninstall the desktop weather and another one called When U Save.