To restore the taskbar in Windows XP or a newer version of Windows, disable the auto-hide option through the Control Panel, or drag the taskbar up from the bottom of the screen in case it has been accidentally resized. Alternatively, access the Task Manager, and restart the Windows Explorer process.
To disable the auto-hide option, press the Start key, and click on Control Panel. Type “taskbar” in the search field, and click on the Taskbar and Start Menu link in the list of results. Once the dialog box appears, uncheck the box next to the Auto-hide the Taskbar option, and click OK. If that doesn’t work, modify the location of the taskbar by selecting the desired option from the drop-down menu in the same dialog box.
If the task bar was accidentally minimized, a double-pointed arrow should appear when you move the mouse pointer near the bottom of the screen. Once the arrow replaces the default mouse pointer, click and hold down the left mouse button and drag the pointer up. Release the button once the taskbar appears. To prevent it from moving, right-click on the taskbar, and select the Lock the Taskbar option.
To restore the taskbar by restarting the Windows Explorer process, press Control, Alt and Delete or Control, Shift and Escape keys at the same time, right-click on explorer.exe, and select the End Process option. Click on File, select the New Task option, type “explorer.exe” in the field and click OK.