Try to authenticate via Meta tag method as described follows:
- Add a <meta> tag to the default webpage
You can add a <meta> tag containing the authentication code to the <head> section of your default webpage. You should be able to modify the <meta> tag to conform to the HTML standard you use.
The format of the authentication code entry within the <head> section should look similar to this example:
<meta name="msvalidate.01" content="0123456789ABCDEF0123456789ABCDEF"/>
Remember to add meta tag code generated
after <header> code in your site themes header section. The meta tag must be placed before </header>.
for more detailed info see the link given:
http://help.live.com/help.aspx?project=wl_webmasters&market=en-us&querytype=topic&query=wl_webmasters_conc_verifyyoursite.htm
