Adobe Flash Player will prompt to download updates 30 days after being installed.

This can be disable interactively or unattended.

This can be disabled via the Flash Player Settings Manager:

http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager05.html

To disable the updates in an unattended install:

- Create the following UTF-8 encoded text file:

%SystemRoot%\System32\Macromed\Flash\mms.cfg

AutoUpdateDisable=1

Adobe - Flash Player : Settings Manager - Global Notifications Settings Panel
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager05.html

IT Administration: Configuring Flash Player auto-update notification
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=16701594