One of my first first person RPGs, but I didn't like it much. If you like the genre you might try the Lands of Lore games, specifically the first two. Only the first has group combat and both are closer to hack-n-slash, but on an exploration level they're superior. Avoid the third at all costs though.
Overall I had a lot more fun with Might & Magic 6 through 8, and they still run well on Windows XP.
Also liked Ravenloft: Stone Prophet, but that was a DOS game back when CD's were just starting to take hold. I dont know where to find it now and doubt it would run without DOSBox or something similar.