下载地址
http://download.microsoft.com/download/7/5/8/7580D7D8-7F31-4358-9761-71033D91AB29/VS2010Ult_RC.iso
The CRC and SHA1 hash values of your downloaded ISO image should match these:
CRC: 0xC7D5B8AD
SHA-1: 0x8131CFAA9C48A6396B2717D06AB2DF8B4B8FA734
Use a hash extraction tool of your choice (several are available online for download) to compute the hash values.