finally found the trick under win7 :
After launching the game, start manually the update service that'll tell the game what you're entitled to:
press the "windows" key + R (shortcut for the "RUN" command) then type "services.msc".
That'll open a window listing all the services. scroll down to the "D's" and look for Dragon Age. once it's highlighted, click on "start service" and you can alt+tab back to the game and see all your contents. No need for the 1.05 patch with increase lag/load time