What OS are you using?
Does the taskbar move randomly happen by itself or does it happen during a specific action? (For instance, Windows sign-on).
Have you tried to manually minimize all programs and then open iTunes?
Can you enter iTunes with alt-tab? Try this before and after you've minimized everything else. Also, try the same things above, except you use Win+D to minimize everything at once.
☆ 3DS: 3883-6119-6754