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Me three years ago.
I'm having the exact same problem. Good ole XP fucked me out of the endgame videos. Lousy microsoft.
FO1 Sniper Rifle
FO2 Pulse Rifle
FOT Browning M2 with the depleted uranium rounds (critical hit on humanoid robot for 1803 hp)
I don't think so because Vault 0 was supposed to be the main vault and all of the other ones slave vaults (so to speak). All of the really...
Maybe try to use autoload (Control + L) and see if you have an autosave from way back. Might be a couple of missions back, but it beats the hell...