Every time you log off, Windows saves the size and position of the taskbar, as well as the size and location of your Explorer windows for the next time you open them. But you might want to set up your taskbar and folder window arrangement once and have Windows open that way in the future, regardless of how you change them during your current session. To do that, arrange your windows and taskbar the way you like them, then launch the Registry Editor and look for this key:
In the right pane, double-click on the 'NoSaveSettings' key. In the 'Value Data' box type in 1 then press 'Enter'. If this key does not exist, right-click in the right pane and select 'New->Dword Value'. Name the new value 'NoSaveSettings' and enter 1 in the 'Value Data' box then press OK.
You may have to log off and log back on again before the setting will take effect. Thereafter, each time you log on and open Explorer or any folder window, it and the taskbar will return to the size and position you froze them in, even if you rearranged or resized them during your previous Windows session.