Microsoft silverlight..

N-Y said:

whats the main purpose for it... and do we need to have it on... a few times its asked me to update it... but am i better off deleting it?

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You don't need it at all unless there is some specific website you visit that requires it, which is pretty rare. Probably the most common site/task that requires Silverlight is Netflix video playback. You don't need it to use the Netflix site, just to stream their videos to your computer.