Problem Mounting during download with OSX 10.4.4
 

When I try to download limewire it gives me the message that the mounting failed. When I try to open the icon on the desktop it gives me the message that "The following disk images failed to mount" "image: limewireOSX.dmg" "reason: not recognized"

I've been trying to solve this and it could be really simple, but I'm new to Apple and I am thoroughly confused right now. Any help would be greatly appreciated.