Installing directly to my other drive

Hey, I have a question, not directly for Maplestory, but another game im trying to install has a similar downloader, I can download the downloader itself, but when going to install the game it attempts to put it on my C: drive by default, which doesnt have enough room, how do I change the destination to my E: drive, which is a separate Harddrive I had installed without the game ever attempting to go onto my C: drive? Any and all help would be appreciated =O