Actually you can, go here. Samsung has an app called AllShare
http://www.samsung.com/global/allshare/pcsw/
I found this on my Smart TV page on the downloads section.
http://www.samsung.com/us/support/owners/product/UN32EH5300FXZA
check your download area for your model TV, and see if the page offers it as a download.
Les
PS. I found this article later-on talking about it here.
http://mywindows8.org/stream-videos-from-windows-7-pc-to-tv/