Elanthius, in previous version I forgot to remove OpenCL.dll from the py2exe distribution. It is not there in current version and you should check that you have Stream SDK 2.2 installed and proper version of OpenCL.dll loadable by miner. Be sure there aren't multiple versions - for example if an nvidia one from previous drivers load first it could give you this error.
Hmm, I have an nvidia card that is OpenCL capable. I tried copying over the OpenCL.dll from system32 but that still crashes. In the end I just copied the dll out of the previous version and that seems fine. I'm getting 20Mh/s on a GeForce 8800 so its definitely using OpenCL appropriately.