get a download manager it will just simply pause your download if the internet cuts out and you can resume it when you are connected to the internet again
this way you wont have to to start your download all over again
my favorite is called Internet Download Manager it costs about $20 but they have a free 30 day trial you can use and then decide to buy it or not
if you have firefox there is a completely free one called FlashGot and its also very good