To answer your second question, it'll depend on two things, if its one physical drive or two, and if they are SATA drives or IDE. If they are two SATA drives you'll get next to 0 slowdown, if not you might get some lag while things load but not during gameplay unless the game loads on the fly.
To give a short answer to your first question, assuming your TV and PC have a HDMI cable you could buy a HD Wireless Sender but these can be expensive, or can get a flat HDMI cable and run it under the carpet. Or move your Media PC next to the TV, and hook it directly up to it, then connect it to the network via wireless or ethernet. Bare in mind that not all graphics cards with HDMI ports allow for sound to be transmitted with the video.
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: ) Skid : )
My Multi-Monitor Focused YouTube Channel:
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http://www.twitch.tv/SkidInc"Imagination is the only weapon in the war against reality."