Glyld

I'm looking to find a small, preferably free or very inexpensive, program that can download a single file from a website daily, drop it in a folder, and overwrite it each day on a machine at my work. Right now one of us in systems walks back and just manually takes care of it, which really doesn't take more then a minute or two but we'd like to automate the process now as the company is growing fast and better to set something up while we're in just one location. Anyone happen to have a suggestion? To make things a little more clear: We connect to the Postal Service website and pull down updated addresses each day, to the same location, and overwrite the previous days file. That is what we are looking to automate.