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13 Sep 2011  

Windows 7 Home Premium 64bit

There is no limit to re-installs as far as Im aware, other than it can not be activated on more than 1 PC at a time.
Unless its OEM, in which case it can only be re-installed on the same machine.

You may need to call MS to get activated if you re-install/activate excessively though.
But every few months shouldn't pose a problem.
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