Given the mention of an "IT guy" I'm assuming this is a business laptop, so I'd ask them. It could be they're now restricting user access as a result of problems, or it could be they made a mistake, but either way before breaking down the back door you need to obtain permission first.
John
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My notebook has been re-installed by our IT guy and since then I cannot download any programs as it requires "Administrator" authority to do so. anyway I can cancel that ?

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