Greetings Amadeus~
I would also suggest, that you RIGHT CLICK on any BLANK area of the taskbar and look and see if 'Lock the taskbar' is NOT checked.. if it IS checked .. uncheck it .. and proceed as Charliedog suggested by left-clicking and holding at the top of the taskbar, the cursor will change to a 'double arrowed' shape and then you can drag it to the size you desire, and then right-click again on any BLANK area of the taskbar and place a checkmark on Lock the taskbar, which will lock it into place.
Hope that helps.
~LoneWolf