I am administrator of my Mac, but am refused updates not being recognized as administrator

I am administrator of my Mac, but am refused updates not being recognized as administrator.
Also I get notices of updates, but when I ask for installation see statement like "looking for update server" and the update is never installed.
How can I convince Firefox tat I am the administrator ?

You can try this:
Mac OS X 10.6 Help- If you forget your administrator password

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