Removed some post that was not really needed...
Also, if the problem you are having is crash then there is patch for this. And if you bought the game from gamers gate then you can use their downloader program to install that patch. If you have any more problems with installing the patch please contact GamersGate for more support.
As for getting through the last part it is simply a matter of jumping over the rubble and avoiding the gas and you have 3 minutes before the entire room collapses.
Here is a youtube video of the section:
http://www.youtube.com/watch?v=Aan-2AeZv...re=related
Check at 08.00