Myst 3. Game crashes

I am having problems with Myst 3 which I have attempted to copy.
The game installs runs fine and looks great for about five mins or so and then just locks up the machine completely.
What I need to know is,could this be due to a bad copy that I have made, or would it more likely be a problem with my pc. I cannot test with the original cd,s cause I dont have accsess to them any more.
win98, 450 p3, 256ram, magic tnt2 riva.
Thanks for any help on this.