This generally shouldn't happen. I never see UAC prompts with MC unless it is installing a new build, and I don't run it explicitly as an admin.
However, I know there is some weirdness with TV Tuner support, especially certain devices, which may be involved (since you mentioned opening the TV Tuner device), so someone else might need to comment.
Generally, though, no. And if you are seeing UAC prompts during general use of MC, non-TV-tuner related, then something is wrong.