I kept getting an error message while playing through the first Phantasmagoria so I put it on hold (came to chapter 4 without problems though).
With the risk of going a bit off topic here, now I've started playing through the Gabriel Knight games instead. Just finished Sins of the Fathers. It's still one of the best games ever IMO. The urge for playing Gray Matter is increasing.
I'm also thinking of getting Jensen's book Dante's Equation. Have anyone here read it?