FileForums - Chaos Theory Key

OK,
I'm new here and I'd like to say sorry but I couldn't find my answer after an extensive searhch through the threads. I used SF nightmare and disabvled my cd drive but I keep getting the message:
The Disc Key you entered does not correspond to the disc in the drive.

I've used this key: 2Q4PL-S4YXN-QSULH-VR53S-SNH7F among others that I have found on numerous websites. NOne of them get me past this error message. Does anyone have one that works? Once again, sorry is it is in the threads, but so is a lot of bs, so I couldn't find it