Old system help

[Prometheus]

Ok, I think that something went wrong with your installation and I would recommend two things to do.

1.) Reinstall the game completely. Then before installation turn off your antivirus because you already know that copy you have on your disc is safe. Sometimes antivirus programs can do some damage to instalation for some reason. Install game and after instalation dont update it or delite intro videos, just thry does fresh instalation work. If it work than proceed with updates, adding mods, etc...

2.) If fresh installation doesn't work again, and if it is possible for you borrow copy of game from some of your friends and try to install that one and if that works great if not it may be even some hardwer issue that causing problem.