I can't open a silverlight dmg file-it always opens Terminal window

Hi,  I can't open a silverlight dmg file to watch netflix.  I am running Lion on my 2.66ghz iMac i5 with 10.7.3. I can download and install silverlight but when I try to open the file, it always opens the Terminal window.  Please Help.

It sounds like all your launch services file associations have somehow been corrupted.  I suggest your reset the launch services bake to their initial default settings.
The easiest way for you to do this is probably to get a maintenence utility like OnyX (download the Lion version for your case).  It has, among many other things, a way to rebuild the launch services.  Launch OnyX.  It will ask for your admin password and a window like below will be dispallyed.
As you can see from the above picture in OnyX you select Maintenance, Rebuild tab, check the LaunchServices checkbox, and click the Execute button (not shown here but it's at the bottom of the window).
Note, the above shows the window for the Snow Leopard version of OnyX.  I don't know if the Lion version is different since I don't use Lion.

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