Something fails to initialize. PErhaps there are registry entries which contain information such as the location of a Temp folder used by Bryce and located in the Bryce install folder. If it's been uninstalled, then the registry may now be pointing to a non-existing folder. Attempting to open some files that are needed when launching the app would then fail. The app might be smart enough to try and create a new Temp folder where needed, but it may fail to do so if the higher-up folder is missing too.

That's just one scenario, but you might want to check in the system registry if there's a group of entries for Bryce 6 pointing to Bryce 5 folders or the other way around. I'd completely remove the install folder and the registry, then reboot, then re-install.

Check also in Google for 0xc015002 - there's a number of people who have seen the same error before, you might find a way to fix it from there.