A couple of important points:

Never install more than one program in your computer at a time. After installing a new program, use your new program and other older programs for a few days to make sure that everything is working fine. Then install another program if you want. If you install few programs at a time and the computer malfunctions, it is very difficult to pinpoint which program(s) is causing the problem.

If you ever need to remove a program from your computer, on a Windows XP machine, click on Start, point to Settings, click on Control Panel, then double click on Add/Remove programs icon. In the resulting dialog box, highlight the program you want to remove by clicking on it, and then click on Add/Remove.