Not built into Windows but if you want a really fast/basic one Everything (free) has duplicate searching by name/size. For anything that needs more accurate searching (i.e. by file hash) by far the best one I've used is Duplicate File Detective, has a 15 day fully-functional trial too.
Directory Opus has one built in (to the Pro version anyway, no sure about the Light one) plus has a 60 day trial... after which I could almost promise you'll buy it anyway, though it's not cheap.
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