from http://superuser.com/questions/245775/is-there-a-built-in-checksum-utility-on-windows-7

CertUtil is a pre-installed Windows utility, that can be used to generate hash checksums:

certUtil -hashfile pathToFileToCheck [HashAlgorithm]
HashAlgorithm choices: MD2 MD4 MD5 SHA1 SHA256 SHA384 SHA512

So for example, the following generates an MD5 checksum for the file  C:\TEMP\MyDataFile.img:

CertUtil -hashfile C:\TEMP\MyDataFile.img MD5