Anyone know where I can find any lore on this or if the previous games exist anywhere in a form that can be played on a Windows 7 machine? I know roughly nothing about it, but you guys have managed to pique my curiousity.
For lore, the basic in-universe guide is available
free. They used to have the old house handbooks on there too, but those have disappeared since they just put up a new site, though supposedly they'll be back once they're finished building it.
For games, Mechwarrior 4: Mercenaries, the last vidya, is also
free on the intertubes. There's also
Mechwarrior: Living Legends, a fan mod of Crysis: Warhead if you want to play online.
Saikoyu: Hanging out with aerospace pilots? You sure you're not a Snow Raven?
Lydia: It's 82 in TRO 3039. Also available in that timeframe are the 85-ton Crockett, and 90-ton Highlander and Emperor. And the 100-ton Marauder II, but that's a Wolf's Dragoons mech, and they are silly. Not that any of those are common models.