This is related to the Microsoft Silverlight application which enables subscribers to watch Netflix movies on their computers. It occurs when trying to load SL 2.0 final app with 2.0 beta 1 installed.
Life can be so beautiful but Netflix error
If using Explorer 8, try switching to Google Chrome. Another suggestion is to change version parameters on 2 Beta 1 and 2 Beta 2 from 2.0.30226 and 2.0.30523 to 2.0.21005. If these solutions do not work, more information - including extensive programming codes, are available at http://forums.silverlight.net/forums/p/39054/112124.aspx
TipFor more information, please see: How to fix Installation error #2105