well, to remove a program in XP, you should be going to the control panel-->add or remove programs, and uninstalling it there.
To your question about windows 7. What was My Computer, in XP, is now Computer, in windows 7. It will be located either on your desktop, or in the start menu. However, to uninstall a program, it's similar to XP. You should go to the control panel-->Programs-->and uninstall it there.