I've had this problem since I had the computer (Aluminum Macbook), ive just been putting it off. But my software update won't update big files. The Garage band 08' update thing, (not sure the full name because im trying to update to OSX 10.5.6 right now, Which has already failed twice. It seems like any big file that it tries to update it fails. Ive even tried a different router because i have 2. Any ideas?