Task bar went to vertical.;How do I get it back to horizontal?

My task bar was across the bottom of my monitor and now for some reason it is horizontal up the left side of my monitor. I have a Dell pc and I use IE8.|||Click, drag, and drop. When you drop it where you want it right click on it and select lock task bar.|||Click on the bar and hold then drag is down to the bottom again.|||hold down the button on the mouse and drag it back down where you want it