Jeffrey this one should work for you.
Instructions -
6.29 beta for MPICH (32-bit or 64-bit)
Download page -
http://folding.stanford.edu/English/DownloadWinOther
Be sure its the MPICH that works with 64-Bit.
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First thing you need a UserID and Password for Windows Login if not already setup.
Once you have run the installer, find the folder where the installer placed the files and run the install.bat. You may need to do so as administrator.
You should be all set to run the client. First time through will setup the client.cfg file for storing all your settings. Any time you want to change the settings simple delete the client.cfg file and start the client again or manually edit the file yourself and then restart the client.
If you have everything setup correctly the client will download a file called "FahCore_a3.exe". This core is the new core which is the one that gives an extra bonus. Let me know if this is not the core that was downloaded.