I'm confused, where are you talking about? You mentioned the task bar, which is part of the desktop, and then you mention the back and forward, which makes me think you are talking about the Internet Explorer.
Assuming you mean the Internet Explorer (the net browser, or web window, or anything else you might call it) has 3 ah...er... button selections. You will see the 3 selections by right-clicking a blank area "somewhere up there" between buttons:
"Standard Buttons" "Address Bar" and "Links"
You can check on or off any of those three. (Depending upon some custom software, you may also have some other selections too.)
One other selection there is "Lock the Toolbar"
My guess is that you do not have "Lock the Toolbar" checked (activated) and thus you can move and drag around the three selections (Standard Buttons, Address Bar, and Links)
So, for the moment, having it NOT locked, drag around the button area (look for a "dotted delineation line along the left side of that area) and adjust it to where you want. You can drag then up and down, left and right, among themselves. Once you get them to the position you want, THEN LOCK the toolbars by right-clicking between the buttons, and checking ON the "Lock the Toolbars" selection.
That should do it. (Again, I am assuming you were having difficulty the floating around of the tool bars within Internet Explorer.
If not, then please elaborate.