There are several utilities that you can use to verify SHA-1 hashes in Windows:
<http://en.wikipedia.org/wiki/Comparison_of_file_verification_software>

Two of these utilities have been included here for your convenience:

1) HashCheck Shell Extension

   <http://code.kliu.org/hashcheck/>

   This is a very lightweight and open-source shell extension that adds the
   ability to verify files using *.sha1 files directly into Windows Explorer.

2) sha1sum.exe

   <http://code.kliu.org/misc/hashutils/>

   This is a bare-bones (just 2KB) command-line utility to generate SHA-1
   checksums in the standard sha1sum format; the -c switch is not supported.
