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Possible Duplicate:
Log in as the Administrator?

There is only one account (my account) on my windows 7 machine and that account is set as Administrator (verified by opening the "User Accounts" tab in the control panel.

But when I try to do any administrator permission required tasks under that account, I was denied for permission issue.

How do I really log in as an administrator?

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marked as duplicate by Oliver Salzburg Aug 4 '12 at 16:19

This question was marked as an exact duplicate of an existing question.

Is it a user account control dialog or another message? – Canadian Luke Aug 4 '12 at 16:00
@Luke Both. Some application complains it has no permission to manipulate a file. Sometimes when I try to edit a file myself, I got a dialog complaining. – CodeNoob Aug 4 '12 at 16:05
up vote 0 down vote accepted

Just because you are an administrator, doesn't mean that every application you run executes with administrative privileges. Quite the contrary, in fact - UAC (User Account Control) ensures that applications run with limited permissions by default, unless you explicitly authorise an elevation of privileges for that application.

Many applications are able to handle this and will trigger an UAC prompt; in such a case, simply approve the prompt (after you've verified that it was triggered by something you did, of course). Other applications, though, will simply complain about lack of privileges, in which case you'll have to restart the application as Administrator (right-click on .exe or shortcut and choose "Run as administrator", or hit Ctrl+Shift+Enter).

An alternative is to disable UAC completely, in which case any applications you run will execute with all the privileges that your user account has, but that's a major security risk, so be sure you understand the possible consequences before doing that. Essentially, you'd be reducing the security of your Windows 7 machine to the level of Windows XP.

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