We already know that Microsoft has finally finished the Windows 7 RTM build and the exact same build happened to make its way to various P2P networks and other downloads sites and services pretty quickly. Users who did already download the release or who might be thinking about doing so should verify the download so that they can be sure that their version has not been manipulated in any way. A German Microsoft employee posted the CRC and Sha-1 checksums of the Windows 7 RTM releases. The Checksums of the downloaded images can be generated for example by tools like Microsoft’s own File Checksum Integrity Verifier or Hashtab.
Windows 7 Retail Ultimate E englisch (x86)
Name: 7600.16385.090713-1255_x86fre_cliente_en-us_Retail_UltimateE-GRMCEULFRER_EN_DVD.iso
CRC: 0x953EFBCC
SHA-1: 0xBC10F09B86DCBAF35B31B0E6FBA7D006ACAAD28D
Windows 7 Retail Ultimate E englisch (x64)
Name: 7600.16385.090713-1255_x64fre_cliente_en-us_Retail_UltimateE-GRMCEULXFRER_EN_DVD.iso
CRC: 0x77BE890E
SHA-1: 0x029DCCEDD7691206010F84CE58343405A4DA92C9
Windows 7 Retail Ultimate englisch (x86)
Name: 7600.16385.090713-1255_x86fre_client_en-us_Retail_Ultimate-GRMCULFRER_EN_DVD.iso
CRC: 0xC1C20F76
SHA-1: 0x5395DC4B38F7BDB1E005FF414DEEDFDB16DBF610
Windows 7 Retail Ultimate englisch (x64)
Name: 7600.16385.090713-1255_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso
CRC: 0x1F1257CA
SHA-1: 0x326327CC2FF9F05379F5058C41BE6BC5E004BAA7
It is advised to not install the operating system if the checksums are not identical.
