Document Classes ⇒ Beamer
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Beamer
If this is the only warning you get you can safely ignore it. It means that the package file
pgfcore.sty
contains the line \ProvidesPackage{pgfsys}
. However, since this is not true for an up to date version of pgf (see pgfcore.sty) I suggest you update your TeX distribution using the MiKTeX package manager.Regards