I had the same problem.
1. Go here and download the orbit downloader: http://download.cnet.com/Orbit-Downloader/3000-2071_4-10600926.html
2. Let Orbit downloader* download it for you...when a connection is closed it automatically opens another until the whole thing is downloaded
*other download managers might work as well, this is just the one I've used.
I also renamed the file to something short like ATI_Driver.exe, though I tried renaming the file w/out using the downloader and it didn't solve anything.
Hope this helps!