To Windows, anyway; equating Windows and DOS does the latter a great disservice, IMHO.

All that is why I've played a lot more AD&D 2nd ed. even though I strongly prefer GURPS and consider it a vastly superior system for both flexiblity and realism. It doesn't really have a steep learning curve, as such, but it's steep at the start and then plateaus. It's easier now, I think, as skills and character points have become more common (skimming the AD&D 3rd ed. rules seemed VERY familiar.... ) It's the only system I know where you can spend hours creating a character (I've spent whole evenings on mages, because of the spell system, but it makes a lot more sense to me than AD&Ds did; BUILDING a grimoire makes remembering what's in it much easier). Once players get past character creation though it almost plays itself, which is the idea; it's pretty realistic, lends itself to any imaginable environment and doesn't require investing in tons of books and dice.

My experience was, ironically, the opposite of yours: I knew GURPS, most of my friends did, and we could usually indoctrinate newbs quickly, but finding some poor dumb SOB to RUN it was nigh impossible (and I lived in Austin, Steve Jacksons global HQ). For a GM GURPS is often a hideously complex nightmare, because while players don't need to know every obscure rule created for every conceivable situation through months of laborious playtesting, the GM does. Unless he's very experienced with both games AND GURPS in particular he'll spend lots of time flipping through a 256 page Basic Set rulebook trying to remember where he saw that one rule (pterodactyl jousting, was that in the Combat Rules, the Advanced Combat Rules, the Mounted Combat Rules or the Flying Combat Rules... wait, was it in the text, or a sidebar... wait, could someone just shoot me now, please? ) Get a GM who knows his stuff and you're usually OK; in a medieval setting you can just toss a newb Dai Blackthorn or the pre-gen fighter, 'cos stats and skills are pretty intuitive. On the other hand, even if he's played GURPS a lot, if he hasn't run it a few times it's gonna be a long night....

It's still the only system where I can team my Bale sorcerer up with Captain Kirk and Billy the Kid to go fight Doctor Doom, and handle it pretty realistically (to the extent you can with something like that). I've got all the dice I need in my Axis&Allies set, several times over, and the only book I HAVE to buy is the Basic Set, though worldbooks are obviously helpful if you have an established setting in mind. Put it this way: When Wizards releases something to replace my twenty year old copy of GURPS: The Prisoner you let me know.