Maple story technical problem(start up)5 mil mesos to whoever helps!!?

Helloo,I am having a problem with Maple Story I havn't had.When I try Starting the game, as soon as the box with the updates pop up and the little mushroom start on,a little pop up on the bottem(toolbar) pops up, and sais (Maple Story Corrupt File):Please run check disk utility.I have tried re downloading it,didnt work.I have played Ms for a few years now and I am almost lvl 188, So plse Help me and ill help you,walk me throgh the steps on how to fix it,please dont give me sites(dont usually work) Thanks i advance,whoever helps the most will recieve 5 mil mesos,ill keep looking at this and add aditional details and Giv my ign/username,thnx in advance!!