Yeah, that's going to happen now and then. This is the first Redsox game I haven't been able to catch on mlb.tv tho, so I think it isn't too bad, especially since they do at least have the archive to watch later. It's $100 cheaper than the Extra Inning cable package and I'm cheap, so I can miss a few live games. Does suck tho.
In terms of hooking the PC to the TV - I don't really know. My husband does most of that kind of stuff, when I ask him to. heh I do know hubby uses the internal video card option, not an external converter, and then it's just a matter of hooking a cable from the PC into the TV (plus sound). We also use a wireless router for the internet signal so we don't have to have yet more cables snaking around the house.
This link might help tho: http://sewelldirect.com/articles/connecting-your-pc-to-your-tv.aspx