Take a look over these guides, i don’t know if this cause the issue, but is possible, you need to try, also try to post on wordpress forum support.
http://refreshless.com/blog/imagick-pecl-imagemagick-windows/
http://php.net/manual/en/imagick.setup.php
http://stackoverflow.com/questions/3036847/how-to-install-imagemagick-on-windows-7
Cheers
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