1) Reboot computer if you have not already - if something went bad to cause it to not display, a fresh computer bootup will solve most all problems.

2) What I see some people do is make the taskbar smaller. Put your mouse at the bottom of the screen - VERY bottom, does it change from a pointer to a up/down 2 arrow? If so, then the taskbar may have been minimized - click while you see the double arrow and drag up a little bit to "expand" the task bar back to the regular size.