Windows 8 tried to down load silverlight tried install and uninstall 3 times It says that it is installed and there it is in apps but it does not open. Eventually went to silverlight site clicked on silverlight for windows 8 and clicked on download. clicked on run and got a message silvrlight app will not run on your pc. Tried this on 1 desk top and 2 laptops got the same message. The silverlight page says silverlight for windows 8 When I click on the app all that I get is download silverlight

Method 1:
I would suggest you to go through the link to remove Silverlight manually and check.

How to manually clean up a broken Silverlight installation

http://blogs.msdn.com/b/rpomeroy/archive/2008/06/10/how-to-manually-clean-up-a-bad-silverlight-installation.aspx

Do not perform Method 2, if Method 1 resolves the issue. You can try Method 2 if Method 1 does not work.

Method 2:
I would suggest you to disable the anti-virus software temporarily and check.

Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you are connected to the Internet or a network during the time your antivirus software is disabled, your computer is vulnerable to attacks.