Netflix says i need to install silverlight but it is already installed

Go to this microsoft page and download silverlight.
Install, reboot and enjoy
http://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx

You need to be logged in as an Administrator. Then you can download and install the program with Microsoft on this link:

Get Silverlight Microsoft Silverlight

NETFLIX CUSTOMER SUPPORT PHONE:
1-888-638-3549
PRESS 0 AT EACH PROMPT.
Average Wait: 5 mins - 24 hours, 7 days
OR
Netflix Calls You Instead
http://gethuman.com/call-back/Netflix/
http://www.netflix.com

Netflix does not use Flash Player. Netflix used Microsoft Silverlight. Be sure you have the latest version installed.
Microsoft Silverlight

try removing silverlight plug in from your computer and then download it again
hope it helps

To begin watching movies and TV shows from your PC or Mac:

1. Open an Internet browser and go to www.netflix.com
2. Sign into your Netflix account
3. Select a title to Play

If you do not already have Microsoft Silverlight plug-in installed, you will be prompted to download and install the free plug-in for your web browser. Just follow the instructions to get started.
For detailed installation instructions and system requirements, see the Complete System Requirements for Silverlight page.

https://signup.netflix.com/
the sign in button should be located at the top right of the screen.

NOTE: Make sure you have the latest version of Microsoft Silverlight installed
http://www.microsoft.com/silverlight/

2/24/2013 Netflix Error Code N8161, Protection Error Problem became a recent problem on 3 of my five XP computers, one Home Edition, the balance are XP Pro. After trying uninstalling and re-installing Silverlight, all the adobe products and Media Player I finally resolved the problem by uninstalling the current Silverlight 5, restarting the PC and then and installing old version Silverlight 4. I had to search hard to find a site that both still offered it and that I trusted. Just don't let Microsoft Updates or Netflix demand to install Silver light temp you to update. Chrome insists on the Silverlight plug in update - DON'T DO IT. Firefox and IE8 seem OK, at least for now.