Try doing the following:
Click Start, Run..., enter "cmd", press OK.
In the appearing black window, enter "nslookup g.live.com", and press
Enter. After the command is finished, enter "nslookup
download.microsoft.com", and press again Enter. After the command is
finished, right-click in the window, and select "Select" (or, "Mark").
Now press your mouse down in the top-left edge of the output window, and
drag your mouse to the bottom-right corner, so the contents gets
inverted. Release your mouse, and press Enter. Now paste what has been
copied, in a reply here.

You can close the black window by entering "exit" and pressing Enter.
--
mynetx [Messenger news, Windows tips, and more...]
http://blog.mynetx.net/
marco polo wrote:
> I have windows vista home basic 32-bit, and i am trying to install windows
> live messenger 8.5. I am able to get to the download screen on
> http://messenger.live.com; however the connection seems to get lost right
> when i click on install. Here is the message obtained on the screen:
>
> Address Not Found
> Firefox can't find the server at g.live.com.
> The browser could not find the host server for the provided address.
> * Did you make a mistake when typing the domain? (e.g. "ww.mozilla.org"
> instead of "www.mozilla.org")
> * Are you certain this domain address exists? Its registration may have
> expired.
> * Are you unable to browse other sites? Check your network connection
> and DNS server settings.
> * Is your computer or network protected by a firewall or proxy?
> Incorrect settings can interfere with Web browsing.
>
>
> Can someone please help me, i really need to install the software and i know
> its not a connection issue because my roomate who uses windows xp was able to
> install it on his laptop.
>
> Thank you in advance!!