How To Install Dynamo ? Help Help

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<div>Hi, I’m MD. Foysal Rahman. I’m new in Revit ,I’m try to install But I can’t install Dynamo (nstall Version 0.7.4,) , When try to install this message are displayed, "(Internal error:Cannot expand “pf64” constant on this version of Windows) "

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<div>Problem Image</div>
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<div>I’m using Vasari Beta 3 , Windows 7 Ultimate 32 Bit,</div>
How Can I install Dynamo.</div>
Please Help me…