Hello,
If your system is functioning properly, feel free to disregard this; DCOM is merely one of your system's integral components, akin to the Start Menu. To provide more context, the specific instance you're encountering is the "Thumbnail Cache Class Factory for Out of Process Server". You can verify this information by exploring your Registry: navigate to HKEY_CLASSES_ROOT (HKCR) > CLSID > [the specific DCOM ID].
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