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I have the x64 version downloaded from the site, open it up on a windows 7 x64 machine and with in second of running the setup I get a "The system cannot open the device or file specified" I click okay and another error pops up "The system can not find the path specified C:\Users\rgoins~1\AppData\Local\Temp\_AI85F1.tmp\x64\SBD\SBD.msi" I click okay on that and it kicks me out of the installer.
Sounds like a corrupt download. The best would be to clear all Temp directories and Cache's. Download the file again, but use the "Save to File".
Then run the install.