Be aware that the /S switch must be written in upper case.
picasa.exe /S for silent installation
Under a locked down environment users can still change the desktop wallpaper and screensaver using this application, via menu items "Create->Set as Desktop/Screensaver." Ensure you configure group policys under User Configuration\Admin emplates\Desktop & \ControlPanel\Display to set standards and prevent changes to those.
If the /S switch is used Picasa automatically starts up.
To prevent picasa 2 or 3 from prompting users to scan their drive for pictures, u only have to create an empty thumbs_index.db
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