Mark3w

As far as I am aware, you will only get the "invalid disk" error if you are outside of the US.

If you're trying to run Knights of the Old Republic II: The Sith Lords under Windows Vista, you will probably encounter the 2 common errors ("Invalid Disk" error & "Knights of the Old Republic II: The Sith Lords has stopped working"). This fix has been tested under Vista 32bit, using an Intel 32bit processor and an Nvidia graphics card, but the fix should work for others. 1. Install KOTOR2 from the CD (You do not need to run it in compatibility mode). 2. Update to the latest version - this will cause the "Invalid Disk" error. 3. In order to solve this error, you will need to go to the SecuROM support page (http://www.securom.com/message.asp?m=analysis) and follow the instructions there. They will respond and send you a new exe file which will fix this. 4. You will (on occasion) encounter the "Knights of the Old Republic II: The Sith Lords has stopped working" error. This is due to a file conflict issue. 5. In the KOTOR2 root directory (e.g. C:\Program Files\Lucasarts\SWKOTOR2) there will be the file "Mss32.dll". You will need to replace this file with the one from the KOTOR1 directory (If you don't have it, try FileFront.com or Google.com). 6. Start playing ... Happy gaming folks