It's been awhile since I played the game, but I'm thinking you might have to something else first. Have you checked any of the walkthroughs here at Gameboomers?
There is a patch, but it appears to mostly fix stability issues with P4 processors that use hyperthreading.
at's New in This Release: This patch fixes stability issues found on some systems (mostly Pentium 4 with Hyper-Threading technology). However, upgrading to it is recommended for everyone. Please, note that any current savegames you have are not supported!