I believe that the EventTypeField attribute was dropped with the release of the November CTP (along with the attendant requirement to specifically decorate event types as such); you should be able to remove the [EventTypeField] attributes from your code and rebuild the project without any issues.
The only reason I can figure you're not running into issues on a Windows 7 box is that there's an older (possibly August CTP) lying around that's being picked up by accident.
Yep, that must be it, Mark. When I look in object explorer between both win7 vs win2k8r2, the win2k8r2 side is missing EventTypeField. It just seems odd that the windows 7 and windows 2008 have the same verison of this file: v2.0.50727 (Microsoft.ComplexEventProcessing)