Moving on up to a 486 (a Ferrari of a machine, in those days!) and I remember the brand well - it was a Dell, and I stuck with this brand for the next few years.
The game is the original 'Gabriel Knight', a point & click from Sierra Games similar to last month's 'Indiana Jones' game, but with celebrity voices, a marvellous soundtrack and a voodoo plot that was totally immersive.
It went on to spawn two sequels (which I also played) dealing with werewolves and - of course! - the Knights Templar, and I would love to see a new game featuring the same characters with modern rendering!
You can see progression in PC games in this series quite clearly – the initial game was a point & click with cell-shaded graphics, the second used a lot of the dreaded video cutscenes, and by the time the third and last rolled around, we were into 3D environment (albeit a rudimentary one, by modern standards).