If you ever download stuff off of web, you should use some sort of checksum tool. I believe in most Unix/Linux flavors of Operating Systems, come with a checksum tool, but no such luck in Windows.
Have you every wished every edition of Windows came with checksum tool? Well, almost. As far as know, most of the Windows versions do not come with this tool, however, Microsoft does provide one. In the past, I have used to use various other third party tools whichever I could find online at that instance, but I would rather use one that is provided by Microsoft itself.
So, just go to this page and install it:
As the page states, this small command line tool works on Windows 2000 or higher.
Hope you find this useful.