The original CRC and SHA-1 checksum values for Windows 7 RTM Build 7600.16385.090713-1255 untouched (original) ISO from Microsoft are now out! Daniel Melanchthon who writes on one of the TechNet blogs has posted the original hashes as follows:

• 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

Make sure that the iso files you download matches the exact hash values as stated above. Use HashTab utility to check whether you have got the real thing or not.

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