Hi,
Have you tried this?
Right click on any area of your desktop, where the taskbar was.
Then click on Properties.
Click on the Taskbar tab.
See if "auto hide the taskbar" is checked. If so, then left click on it to uncheck it, click on Apply and OK.
Also, see if "hide the taskbar" is checked. If so, uncheck it.
Might work, be worth a try.
Best of luck.