Question: The task bar does not show up at all even when the cursor is on the gray bar it does not turn into the double ended arrow
Answer: Once you are sure that you have not just reduced the height of the taskbar to a single line you may need to take more drastic action.
A completely missing task bar can be caused by a corrupt registry entry. If this is what has happened then if you run regedit and go to HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Explorer and delete the entire StuckRects key then the task bar should come back after you reboot.
You should back up your registry first before making the change just in case you need to recover the entry or make a mistake. Modifying the wrong entry in the registry can cause major problems so take care. I accept no responsibility for any consequences of your applying this change
Oh, if you are wondering how to run regedit without the taskbar (meaning that you can't use Start/Run). Go into My Computer and then into your C drive and then into the Windows folder where you will find the program regedit.exe. Also to shut down without the taskbar click on the desktop and then hold down the Alt key and press F4.
This article written by Stephen Chapman, Felgall Pty Ltd.