You need to install Smartshare server app on your PC and there share folders you wish so watch on tv. Windows Media Server is unstable and not compatible with some video/audio codecs..
Download Smartshare and install from here: http://www.lg.com/us/support/product-help/CT10000018-1427120133847
When you install choose what you wish to share from application on your pc...In tv app will see icon LGPC.
Also you can install any dlna based servers like plex, universal server, serviio...and many others..
No more unstable connection