Microsoft problem

Hi i have microsoft word, excel etc on my computer and have never had a paroblem with it till now everytime i try to open the microsoft starter english it pops up in a window saying this cannott be opened please try again or repair the program in control panel, have tried numerous times and still cant work out how to "repair ' it in  the control panel, helllp i have no idea what im doing and i really really really need this to work now :(