Welcome to NMA Kenneth.
In my case, I was playing Baldur's Gate, when during the week a friend moved back to town, and asked if he could get his mail ordered Interplay anthology sent to my address ~since he hadn't his own just yet. I gave him his games when they arrived, and thought nothing of it after that... But a few weeks later he gave me the set, and it included Fallout.
I began Fallout coming from Baldur's Gate, and within minutes, I thought, "This was a mistake; what IS this?". But after an hour I think I was hooked on it, and wouldn't stop playing until I'd completed it; which may not have been on the first PC. I don't think I found a better RPG until Planescape; and even then Planescape is not the better game.