microsoft office starter vanished from my programs

My computer came preloaded with microsoft office 2010. I  have a toshiba with windows 7. I had the computer 1 year. I finally wen't to use microsoft office a window came up. I clicked on microsoft office starter, it said it was already preinstalled on my computer. I granted changes to microsoft to finish installtion of 2010?  although it was already on my computer. Eventually office 2010 starter opened. I used it for a document and closed it. Later I tried to use it again. When I clicked on office 2010 it states microsoft officer starter 2010 is already installed on my computer. It says to click on all programs at the start menu and it should be there, but it isn't. Microsoft excel starter is though. What happened to the microsoft office starter that was pre-installed on my computer. I'm so tired of buying expensive computers that come preloaded with microsoft this or that but the programs always stop working  or you have to purchase them again through microsoft.