When i download java everything goes fine but then when i install it a message says-?

[Wee Dylan]

this installation package could not be opended, verify that it exists and that you can access it or contact the vendor. ect. .... please help so that i can install it!!!

thanks x
i have tried deleting it and reinstalling anyway i cant uninstall it in the 1st plack because i never get to finish the installation!!!!! HELP!!!

when i try to open limewire it says download java, limewire requires java 5.0 or over thats why i really need it!!!