Well, im not quite sure wots happened to your command prompt but i'll talk ya through the long way of doing it.
Go to START, CONTROL PANEL, click on ADMINISTRATIVE TOOLS, click on SERVICES. wait for the new window to load and then scroll down the list until you find an entry named "server". Double click on it and click START. Also, make sure that in the drop down menu on that same screen you have selected "AUTOMATIC" as the startup type.