I get the following errors with the official BOINC for Windows x64 client v5.10.7:
6/29/2007 8:37:35 AM|Einstein@Home|Message from server: platform 'windows_x86_64' not found
6/29/2007 8:37:35 AM|Einstein@Home|Deferring communication for 1 days 0 hr 0 min 0 sec
6/29/2007 8:37:35 AM|Einstein@Home|Reason: requested by project
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Platform 'windows_x86_64' not found
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Read http://einsteinathome.org/node/192878&nowrap=true#71288