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I tried to copy some files into a subfolder in 'C:\Program Files' folder but it failed with an error message 'You'll need to provide administrator permission to copy this file'. I am the only user of this computer and there is only one account in Windows 7 (of course my account) What's the problem?

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which subfolder ?? not knowing I'll guess it is owned by TrustedInstaller, take ownership and grant yourself permissions.… – Knuckle-Dragger Dec 24 '13 at 3:39
@OP: run the copy from an elevated command prompt or via an elevated explorer. (To elevate a programs rights, right click on it and use the "Run as administrator" option). – Hennes Dec 24 '13 at 12:30

That is not a problem, it's User Account Control in action. When that is turned on, all users (even those in the administrator's group) normally run as a limited standard user, and administrators must actively give consent for actions that require elevated privileges (such as writing to the Program Files folder).

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