You need to have the 64 bit version of boinc. Also, your computer's operating system needs to be 64 bit. Here is a direct link to the 64 bit version of the BOINC software.

http://boinc.berkeley.edu/dl/boinc_6.10.58_windows_x86_64.exe

Thanks,
-Uplinger

Exciting that a 64-bit version has been developed!

I have received 3 WUs, all on my 2 faster machines. One has started running, and the other machine should start in on the two it got in less than a hour. Both are Linux (Ubuntu 10.04).

The estimated times to completion are off -- 3:45 on my fastest machine vs 2:45 on my second-fastest machine. But who knows what BOINC is trying to go by since neither of these machines has been crunching C4CW lately.

Edited to add: These betas have a 3-day deadline.

Project 3, Phase 3? No, AFAIK there is no phase designation for C4CW i.e. no suffix 1. What is guessed presently is, that this science will run for an estimated 2 years, uninterrupted.

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If on W7 it went to \Program Files\ it's a pretty good assurance. W7 does not permit 32 bit installation in there. Now what you see if looking in that old Help > 'About' screen?

The downloaded installer itself also is identified with 'x86_64' in the file name.