|Click on an empty area of the taskbar and hold the mouse button down.|
Now, just drag the mouse down to where you want the taskbar to be. Once you get close enough, it'll jump right into place.
To keep it from jumping around again, right click on the taskbar, and then select Lock the Taskbar.
If you like, you can actually put your taskbar on top, the bottom or any side of the screen you like.
NOTE: make sure you have unlocked the taskbar before move
um...can you tell us the other problems "similar to that"