Right-click anywhere on the Desktop (not on an icon) and select the "Properties" option. On the "Settings" tab, click on the "Advanced" button. From this point, go through each of the tabs and click on buttons to see if there are any options for rotation.
Right click on the taskbar, click on lock taskbar. By clicking on it make sure it is unchecked. At this point left click anywhere on the taskbar and hold it. Keep holding it and drag it to where you want it. After you finish make sure to lock it so it won't move anymore.