Very strange, it says my user is Administrator but when I enter in "Change your account type", it says that it's a standard user and I can't change it to Administrator.
If I check "Administrator" radio button, then the "Change Account Type" button will become gray, and I can only select the other button - "Cancel"
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Also when I type in cmd "assoc .mp4=" it says "access denied" so probably my account is not Administrator. Not sure though.