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Hi there, sorry to hear you're having trouble,
the reason for this is that the tv has limited streaming support for sources on your home network, and will only connect with a DLNA server.
The problem here though is that Vista is just too old and doesn't support DLNA. Do you have another computer you can try streaming from?
Or depending what content you're wanting to watch, you might try using a dedicated streaming device like an appletv, chromecast, or roku which would help you to share content on your computer to the tv, these are available for about $30-100, and would be your best bet (besides hooking the computer up to the tv directly and using the tv as a monitor) other than upgrading windows or buying a new computer.
Google Chromecast HDMI Streaming Med... (click for link)
Thank you for the quick answer! Much appreciated!