Unable to Unzip rar files

[BMWZ3]

I have the wierdest problem.

I have downloaded all the parts for 2 games, frequency and Tsugunai Atonement.
When I run sfv checker on the files, the sfv check says all files are ok.
But when I go to unzip the files using WinAce, WinAce pops up the unzipping status dialog box for 0.1 seconds and then does nothing.
Then I also tried using StuffIt Expander and it tells me there is a CRC mismatch error, but it doesn't tell me which part of the rars has the CRC problem.

Any ideas ??