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#21
I am not certain. What I do know is that if I'm going to mess with the registry, I do only one thing at a time so that it is reversible should something go wrong. I always have a backup of my ENTIRE CURRENT REGISTRY before deleting any one thing.
I haven't had a single DCOM error for a couple of months now and my computer runs flawlessly; so deleting them (GUID's) hasn't caused any problems or I wouldn't even be able to use my computer if they were vital to the OS structure when booting up or restarting.