Windows 7 RTM is now officially signed-off by Microsoft and quietly leaked on the Internet. If you are in a mood to download the RTM before the actual release date, then you must be assured of some signs.

Some of leaked Windows 7 builds pretend to have malicious code integrated into them. That’s why you must check a build before installing as if its free of any issues. The CRC code and SHA-1 checksums can help you ensure if a build is real or fake.

Windows 7 Original CRC & SHA-1 Checksums:

• Windows 7 Retail Ultimate English (x86)
  Name: 7600.16385.090713-1255_x86fre_client_en-us_Retail_Ultimate-GRMCULFRER_EN_DVD.iso
  CRC: 0xC1C20F76
  SHA-1: 0×5395DC4B38F7BDB1E005FF414DEEDFDB16DBF610
• Windows 7 Retail Ultimate English (x64)
  Name: 7600.16385.090713-1255_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso
  CRC: 0×1F1257CA
  SHA-1: 0×326327CC2FF9F05379F5058C41BE6BC5E004BAA7
• Windows 7 Retail Ultimate E English (x86)
  Name: 7600.16385.090713-1255_x86fre_cliente_en-us_Retail_UltimateE-GRMCEULFRER_EN_DVD.iso
  CRC: 0×953EFBCC
  SHA-1: 0xBC10F09B86DCBAF35B31B0E6FBA7D006ACAAD28D
• Windows 7 Retail Ultimate E English (x64)
  Name: 7600.16385.090713-1255_x64fre_cliente_en-us_Retail_UltimateE-GRMCEULXFRER_EN_DVD.iso
  CRC: 0×77BE890E
  SHA-1: 0×029DCCEDD7691206010F84CE58343405A4DA92C9

You need to compare and match these hashes exactly with your download Windows 7, to check/verify if you have a proper aka real build or not ?

Use this post: HashOnClick – Calculate & Verify Hash values of a file

Update: You can also use Windows 7 ISO Verifier by Long Zheng, which is the easiest way to check and verify your Windows 7 builds.

Download Windows 7 ISO Verifier (EXE, 253KB)

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Most companies provide file hash values (SHA-1) for their software, so you can be absolutely assured that your download exactly matches the source file.

HashOnClick is a free and very simple to use file validation utility. It quickly and easily provides information to compare hash values side by side, to make sure the data in one file exactly matches (or not) with another file.

HashOnClick shows the MD5, SHA1 and CRC32 file hash values, which are mostly used to verify and check the files. It integrates in right-click context menu which makes it easier to use.

An SHA-1 hash value is a 40-character string that identifies the contents of a file. If two files have the same contents then it’s guaranteed they will have the same SHA-1 hash value.

Download HashOnClick   [ Supports All Windows]

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