Comment #20 on issue 1235 by asmeurer: Problem installing in Windows
http://code.google.com/p/sympy/issues/detail?id=1235

This may sound like a stupid question, but did you make sure that Python itself was 64-bit? At least in Mac OS X and Linux, you can run 32-bit binaries in 64-bit. The default installer for Windows is 32-bit, for compatibility reasons. You can check what architecture Python was compiled as by doing

import sys
sys.maxint

if it's 2**63-1, it's 64-bit, and if it's 2**31-1, it's 32-bit. Or, even easier, do

'32-bit' if isinstance(int(2**42), long) else '64-bit'

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