Hello,
First thing to do is delete the set-up program from your system.
Next, delete your temporary internet files, this can be done within Internet Explore: Tools > Internet Options.
More Information on problems downloading can be found at:
http://shoutbox.menthix.net/showthread.php?tid=67828.
Then try and download it again, if that doesn't work, try downloading from a official minor:
http://www.simtel.net/product.php%5Bid%5D96937%5B...iteID%5Dsimtel.net.