Well this is what I was going to post be will put on here and see if anyone gets the dark physx going after doing it.
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if it looks like the installer is not install the code, load bar jump to the end after just doing 20 30% of the loading.
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This problem can occur from time to time. To solve it go to c:\program files\installshield installation information. You will probably see a large list of folders in here all with very long names.
There will likely be two folders for Dark Physics
{8EC28FBE-59C4-4FBC-B707-F8FDAE3CCAEE}
and
{76431DB7-7827-4BA3-98B6-C686AAD21868}.
To confirm these are the correct ones go into each of these folders and open Setup.ini. There will be a listing for AppName. Ensure it contains the keywords Dark Physics. If it does then delete both of these folders.
Now go to the directory where DB Pro is installed and then into the Compiler folder and finally plugins-licensed. In here delete DarkPhysics.dll, NxCharacter.dll, NxCooking.dll, NxExtensions.dll and PhysXLoader.dll. These are the core files for Dark Physics.
Next download the latest version of Dark Physics and install this. Also grab the latest drivers if you not done so already.
Dark Physics makes any hot drink go cold.