Error installing SQL 2012 management Studio : db5eec.msi

I have downloaded SQL Server 2012 Management Studio and try to install on Windows 7 32 bit, but always get an error :

TITLE: SQL Server Setup failure.
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SQL Server Setup has encountered the following error:

C:\Windows\Installer\db5eec.msi.

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&EvtType=0x1ED4CDE5%25400x2FCB8C55

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BUTTONS:

OK
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Is there I have wrong do or step to it??

Thank you...