Rabbit_Master_n and TomCollins.
I was running into this issue as well and solved it by doing the following:
1.) Uninstalling Dynamic C
2.) Going into the registry and deleting all folders pertaining to Digi and ZWorld.
Unfortunately I was a bit frustrated at this point, and was not particularly diligent in recording my steps, so all I can really offer is try manually ripping Digi and ZWorld from the registry as there seems to be some hanging reference.
I'm only using Dynamic C on this computer to compile to a targetless bin for ease of editing files. I use separate computer for actually compiling and loading data to my rabbit boards otherwise I would not have been so gungho so please take my "solution" with a grain of salt, as I certainly am not 100% confident I have not broken Dynamic C in a way I have not run into, but perhaps this can help you.
Best of luck