you can click on this google search and find a bittorent client and
be asured that your download will be good.

<http://www.google.com/search?hl=en&q=bittorrent+client&btnG=Google+Search&aq=2s\
&oq=bittore>

Most good bittorent clients do a check of the file pieces as there
downloaded to your computer.
I like Deluge but Transmission is a good client also.


When I used Windows Nero was a good program for burning ISO images.
Here is a good program to burn images on Windows.
<http://www.imgburn.com/>