I have service pack 2 and im thinking to upgrading it to server pack 3 because I have lots of problem with service pack 2. For ex. My control panel in the add and remove program. All programs don't show. And other things I have to fix. If I update will it be better and fix my problems? Also I'm kinda confused. It tells me to close all open programs and back up my system. If I don't back up my system, will my files,games, etc. be there still? Thanks.

As long as you have a genuine version of windows, you need to install service pack 3, from here which has service pack 2 within it and all the latest updates