Aerienne, I don't know whether or not this will help you but as a fellow computer luddite I find Gozilla ( free off the net )
very handy.
It will search for the fastest download if there are mirror sites, resume interupted downloads, etc.
When the download is complete you can auto unzip with it if necessary, and when ready just click on the 'Install' button and voila. You can install in the suggested file or insert your own.