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Windows 7, Internet Explorer
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Your user account needs to be set to an administrator type. Here's a couple of documents that should help:
Alternatively you can download the offline installer from http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-windows.html#ins tall_in_a_firewall_proxy_server_environment and save it to disk.
Next, right-click on the downloaded installer and select Run as Administrator.