laoleng, Follow these instructions:
Note: You may have to first right click the Taskbar and unlock it.
My Taskbar moved to the left, top, or right side of the screen.
It is common for users to mistakenly move their Taskbar to the left, top, or right side of the screen while working on their computer. If you wish to return the Taskbar to the default position (the bottom of the screen), follow the below steps.
How to move the Taskbar
Moving the Taskbar is simple once you understand the basic steps involved. To move the Taskbar, move your mouse cursor to where the time is currently displayed on the Taskbar. Once your mouse cursor is over the time, click and hold the mouse button down, and while holding the mouse button down, move your cursor to the middle edge of where you want the Taskbar to be. For example, if you wish to return the Taskbar back to its original position, move the cursor to the bottom center of the screen. When the Taskbar has moved to its new location, release the button.
my kid did something on my laptop (window XP). Now the task bar appears on the right hand side of screen. How do I do to change its position back to the bottom of the scr4een.