I found these steps on the Netflix website and it seems to have solved my problem!
1. Quit all open browsers - including this window! You may want to print/copy the following steps.
2. Press and hold the Windows key and tap the letter R on the keyboard at the same time. This displays the Run window.
3. Type %userprofile%/appdata and select OK.
4. Open the LocalLow folder.
5. Open the Microsoft folder.
6. Open the Silverlight folder.
7. Right-click on the is folder and select Delete.
8. Reopen browser and Netflix should work.