Can you confirm that Silverlight is set to "Always Activate" on the Add-ons page?

You can open that using either:

   Ctrl+Shift+a
   orange Firefox button (or Tools menu) > Add-ons 

In the left column, click Plugins. Then scroll down and find Silverlight.

Assuming that checks out, then more generally...

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

In the dialog that opens, you can remove the site's cookies individually.

Then try reloading the page. Does that help?

Thank you for your help. The suggestion was followed to the 't'. But,as of a few hours ago,still the same. My computer freezes up if I try moving forward or back on Netflix. The buffering(?) circle in the middle of the page continues to run for a few minutes,until I try to stop NFlix. And that process takes another few minutes. Not sure if you can suggest anything else. Thanks Ray

See also:

• http://www.google.com/search?q=silverlight+hardware+acceleration+windows+xp

Thanks all. Tried some of the 'new' suggestions. So far no success. Will let you know if there is any progress. Boyo