How To Unlock Toolbar

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I have a very simple, but yet very frustrating problem that has occured whenever I boot up my PC.
Whenever my desktop appears, it seems that I can't access my taskbar below (this includes start menu/quicklinks/everything) and whenever I click on it, I get the typical windows error sound ('dun'). Note that everything else works fine on the desktop (desktop icons, rightclick, etc), but the bottom taskbar is completly locked. I can't seem to figure out what the problem is. However, yesterday, for some reason it was enabled and I was able to successfully navigate. This has been a problem for about 5 days now and I'm totally stumped.
This is really frustrating because now I need to depend on the Windows Task Manager to run/minimize/shut down/etc.
I know this sounds incredibly newbie and I apologize in advance for any no-brainer answer this may receive.
Thanks!