Wow, you're certainly in the minority DM.
Fallout 1 + 2 still run in XP, sure the resolution is low, but that's to be expected (and people will be saying that about Half Life 2 in 5 - 10 years)
But the story, system, background, scripting and characters in Fallout 1 + 2 are top notch.
General opinion is that Fallout Tactics shouldn't even be considered 'cannon' as it deviates from established background a lot. Plus it's not a true Fallout game as it's squad based tactics rather than an RPG. It was ok, but boring compared to FO1 and 2.
I am off to go look at "Torment" though...
I can't recommend it enough, it's wordy at around 1 million words of dialog. But that's whats so great about it, the story is strong. The characters are well developed, entertaining and have genuine depth to them. Plus it has some superb voice acting. It (along with Fallout 1 + 2 and Baldurs Gate 1 + 2) have well deserved places in the best games (and RPGs) of all time. (Btw, full name of the game is Planescape: Torment.)
The general warnings are 1. It's Fantasy, 2. It's very in depth and you may not properly complete (understand the full true story) it the first time round, as it's possible to miss things. 3. It uses the D&D System (Infinity Engine) - It does work Windowed.
Now if I could just get System Shock 2 to work on my PC.