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If you are moving your mouse cursor all the way down (or wherever you have placed your task bar by default), but it won't show up, try pressing the Window key, typically found between the CTRL and the Alt keys. You can also press CTRL+ESC and achieve the same result. If your Start menu pops up after performing either action, this is your chance to manually resize your Windows task bar, as you had probably minimized it by accident.
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In case the above step does not fix the issue, try launching the Task Manager by pressing CTRL+Alt+DEL. In the window that pops up, go to the File menu, click on New Task, and type "Explorer" or "Explorer.exe", without the quotes. This action will basically restart the main shell that allows you to see your desktop icons, launch the task bar and initiate most of the visualizations you see on your Operating System. If this does not do the job, you may need to scan for malware