Had the same problem about a year ago it would high light but not complie, non PhysX code would complied fine. So back up the code you need to keep, then do the as below , quick way to find the folder is to put 8EC2 in the windows search box.
Quote: "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 from www.ageia.com and install those.
When finished you should be able to run Dark Physics and continue working with it.
Regards,
Mike"
Dark Physics makes any hot drink go cold.