MD5 & SHA-1 Checksum Utility
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Full user review
"Basic Workhorse with 64 Bit Support"
--64-bit Windows 7 support
--Does the job, albeit with many steps
--No need to install
--No shell extension or context menu support
--Multi-step, P.I.T.A. usage. Drag and drop file, click hash type, click paste button, drag and drop second file, click verify.
--Only 2 hash types supported.
Seen others that do comparisons automatically for you, but no 64 bit versions yet.