It is a great game, but I've read in a few places that the PC version has graphical issues and a number of freezing/crashing problems. Maybe there is an unofficial patch for it by now, I don't know. I only have the PS2 version, and that is kind of a mess. Major slowdowns and graphical glitches and a few freezes.
I completed the PC version 3 times, never met these problems, it worked fine for me. But that's a long time ago, played it on XP, I don't know whether it works fine on Win7.