Go to your PC's Control Panel, select Network and Sharing Center and open. Double click on 'Network' (the top line showing the link from your PC to your network and to the internet). Make sure your TV shows up in the 'Media Devices' section. If so your connection between your TV and PC is good...
http://www.samsung.com/global/allshare/pcsw/quickguide.html#blink
Try this website, it should take you through step by step. Also make sure you have all Installation CDs for all media. I have a Samsung 40 in LED and it is connected to Blue Ray DVD Player, Computer, Wii, Cable box, and VCR Player...